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If you have hand levers (as in two separate levers not the modern presto type tool) you can remove this in a similar manner to hands, to pry it directly up, you may be able to improvise with screwdrivers otherwise, but that's the method, first time i saw this I thought it had to be pulled apart somehow like other C-clips but no, it pries up and off and is then pressed directly back down again to be refitted.

Thanks Geo, every day is a schoolday. Normally 100% with you on that, but one of the early pictures shows the cap jewel screws on the outside of the balance... which makes lots of sense in the absence of a stud screw. Never seen that before.

I don't usually. Occasionally I will remove them after the ultrasonic wash and clean them separately. As far as this watch is concerned , removing the end stones wouldn't be an easy option.

Your best luck would be a 'clasp extender' a lot of repairers don't even really know about them, but I know that UK watch repair supplier, cousins, provides extensions that can be fitted on to the clasp that effectively makes the strap bigger. They can be a little tricky to fit but I've done this for customers many times, it works well enough. Also you have another problem, the second hand has fallen off.

Stuart you are correct, the cap jewel on the balance cock could be removed easily. The main plate seems to have a simple plate over the jewel which could also be removed easily. Thanks for making me review it and look closer.

What diggingstony meant to say is simply that Seiko balances are interchangeable across 7S, 4R, 6R, 70x and may be even older movements. Indeed, a nice point for repairers and tinkerers.

And if you were to measure it, you could be saddened by finding the entire case now half a mm smaller, after all that wild grinding and sandpaper parading. Both issues would have been easily avoided by, let me say it loudly, buffing, and a $10 rotary tool and felt wheels.

Just don't buff the "brass" off, that would make a sure mess.

Geo - would you advise to remove the end stone from the balance cock and balance end plate from the main plate before putting the assembly in the ultrasonic?

That's a clip... Maybe loosen it up easily with a pair of tweezers and pull it out with a 2nd pair of tweezers...

Good job! What an interesting regulator.

Adam. I would recommend replacing the the the balance cock assembly on the main plate and than cleaning it in the ultrasonic bath. All the other parts should be cleaned disassembled. If you have a close look at the balance spring you will notice that the regulator pins are holding the second coil of the spring, this is incorrect. The outer coil of the spring should be between the pins. Also make sure that the points on the escape wheel are all intact, they are very easy to break. Take great care when fitting the balance during assembly. PS Don't remove the pin that retains the hairspring unless you really have to.

Welcome to the forum. Loads of good info on here.

Hello there. This is a great group here and I am too, hope to take Mark's course sometimes.

Nice movement.. I've got two of them somewhere. Only problem is the poor case and hands. The base metal case is really at odds with what I think is a fine movement. The hands on mine (both) are loose and go out of flat if jarred. Problem is its quite thin and using a stake etc doesn't work well here. Anilv

Hi Erik, All good stuff old boy. You have done well with Marks courses. He is as good as it gets. I was going for it but don`t really have the time. I am nearly 76 now and am just an amateur repairer. I was in electronic design MSc. Electronics and Just A level physics. I got into watches about 1962 as a hobby and started again 2 years ago. I have fixed many and only had one disaster, an Omega Seamaster 300 which I should get on top of one day. It is my Grandsons and the balance is very worn and to boot I lost the top balance jewel under the incabloc lyre. Omega will sell you nothing. I may put an ETA or similar movt: in it if one will fit Joe will not know the difference and it will keep good time. The Omega 552 can go in the drawer. Well, good wishes to you and keep em ticking !!. s

Hi Erik. Greetings from Cambridge, England.