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Do not straighten that pinion, it's supposed to be bent!!!!!! That is the canon pinion set up on a lot of old pocket watches. The bend in the pinion is to create the slipping friction clutch function to allow the train to drive the hands, but also allow the hands to be set without sending torque back into the train. This has been discussed fairly recently but I can't find the thread, however have a look here for more detail.

Sorry, I did not recognize that at the beginning, your watch is a semi-diver, with a thick glass and a deep chamfer to clear the bezel. That makes it "special" and in practice justifies the relatively high cost. If you don't want to spend you can always polish it. Otherwise if you like the domed style https://www.ebay.com/itm/1pc-2-5mm-Thick-Single-Dome-Mineral-Watch-Glass-27-42mm-Round-Watch-Crystal/302493359240

Since the hand turns with the center wheel (which runs true in its bearings), if it is set parallel to the dial it will remain that way. And even during setting, the shaft rides in the hole in the center wheel, which is the guide and is straight, so no problem. Hold your arm up at a 45 degree angle, and hold a piece of cardboard parallel to the ground, now pivot around 360 degrees, the cardboard doesn't nutate, despite the dramatically bent part.

As mentioned above, I don't think that regular flat have enough chamfer to clear the bezel. Just look at your picture to see how it reflects the chapter ring. It is very similar to the SKX diver's crystal 315P15HN02. If you want to try anyway the size to order is definitely 31mm.

Don't think either of those is suitable, if there is an equal chamfer both sides. The gasket side needs to be a very slight chamfer, just to aid entry and the bezel side needs to be a large chamfer to stop interference with the bezel. Also a 30.9mm one it will fall into the gasket, 0.1mm is a VERY big difference . If a 31.0mm crystal is dead size then it will still be only 0.020 of a millimetre larger than the one that you have removed and the gasket will allow for that small difference. The SternKreuz crystal has the tiny chamfer on one side and the large chamfer on the other, the same as the generic 3mm one I linked to before...

Correct, but that doesn't satisfies some, which insist in lubricating the "floor and ceiling". That even before mentioning anti-braking grease to the walls of automatic. Just give time to lubrication threads to grow, sit back, and enjoy.

Very useful link, I'm going to have to get into non acrylic crystal polishing sometime as I have a few watches with scratched non round crystals that are almost impossible to source replacements for at any price.....

Usually the mainsprings come ready lubricated just to fit.

That is almost certainly the original one. THIS one might well be a good substitute, though slightly thicker at 3mm, not sure if the seller ships internationally...(the 31mm crystal is not listed in numerical order but is right at the bottom of the list). I have used these people before and can't fault the crystals or their service. I did think that they listed 2.5mm thick ones but it appears they jump from 2mm directly to 3mm.

That's a die that has only the outer diameter, to avoid pressing on the center of the crystal and minimizing chances of breaking it. That is particularly important with crystals 1mm thick and less. Below pictured are two generic flat mineral glass crystals. Top is 0.7 STK, bottom a 1.5mm Cousins label. Both have a slight chamfer on both sides, which allows to easily install into a nylon gasket of the correct size. Speaking of sizes once again I never had a problem fitting any of these without worrying about to cents of mm (a novel measurement unit with the outstanding property of being 2.5 times smaller than a "thou"). That is because a nylon gasket has a certain compressibility.

Of course. I had not pictured it properly. Obvoius now but not at all obvoius half an hour ago.

It will have to be a new rotor because the bearing only is not sold separately on this class of Seiko. It can be separated and put back but the success of that depends on the tools available and the skill of the person.

That's a shame, but looks like and easy fix with an Arkansas stone.

Well the only 'original' crystal I can find listed anywhere is in Russia and at 1,800 Rubles plus carriage is a lot more expensive. If you do decide to go generic make sure that the diameter and thickness of the replacement crystal is IDENTICAL to the one that you have removed and that it has the same edge chamfer profile and you will be able to fit it back in the original black nylon gasket, with care. I recently managed it with this Seiko 7546-8270 with a similar black nylon gasket to your watch... In that case I was able to use a Sternkreuz XMF 300.863 equivalent, which measures 29.98mm diameter x 2.00mm thick with a 45degree x 1mm chamfer on one side. If there is a 310 version of this crystal, if the thickness and profile is the same as your crystal then at less than £4 from Cousins, it is a strong contender.... edit:- Cousins list 4 Sternkreuz XMF310 crystals, the 310W21GN equivalent, XMF310.857 would appear to have this profile.... While the XMF310.848 appears to be thicker and has a more pronounced edge profile more like the one I fitted to my 7546 above...

There is no need to replace the gasket unless it has been badly damaged pulling it out without care. There is no glue nor dirt, a nylon gasket provides impermeability by mean af a slight friction fit, that is easily handled with proper crystal press and crown type dies.

This is the correct 6309 MS direction, just in case you remember how did you install it.

So not bent enough, then?

Hi Try putting the arbour on a flat surface and rolling it with a little pressure it may help in straightening it. do it gently but firmly. What you are trying to achieve is a reforming of the arbour slowly, As regards it being loose in the wheel one can always use loctite. It is used when pivoting clock arbours when fitting the new pivot so I guess its a legitimate fix. There are several types of loctite depending on what it is being used for so some research regarding the best type to use would be in order. Cheers

Seems about a normal price for a Seiko crystal these days, to me, rarer crystals go for MUCH more....if you can get them for less than £1 please share the information..... (while the one listed may be a generic crystal at least, as you can get the new gasket to go with it, you know that it will fit the watch it is specified for....)

I wasn't suggesting getting one from Boley, just indicating the correct part number and qualifying the information with the source detail.............At least the OP now has a starting point with a part number to search for . It is actually available HERE (no Boley content)..........

I'll start it with this one......

It certainly isn't Rolex's finest work I agree. I wonder if the "explosions" are an artefact of the low level radiation. I guess they may also be caused by some chemical process or moisture ingress. Maybe I should start a "Show us your brownest watches thread" as an antidote to the blue dials one.

According to Boley the crystal you need is 310PB3JN02...

Well that didn't take long to figure out. You win the Purple Internet trophy. "Glory" or more correctly Slava (Russian: Cлава, meaning "Glory"). The watch in question appears to be a fairly classic Slava Day Date, possibly a Slava 2429. BTW I'm not sure whether to include the DVD in the 404 club. It qualifies on price, and its a good watch, but for the life of me I cant figure out where to put the batteries or wind it up.

Hi Watchie found some more information you may find use full cheers Deciphering Seiko Case Back Information — Plus9Time.html Servicing_Guide.pdf

Hi VWatchie I have attached the SEIKO casing guide in the hope you find it useful in your search. 03. Casing Guide seiko.pdf

Warning, Mugshot alert.. DSC07795 by Micky Aldridge, on Flickr