Timex M25 crystal - part number?

[Rory]

I’ve been polishing out what was a skating rink crystal on an M25, but it has a crack/blemish on it which really deserves replacing.

I’ve got some possibles on eBay, but to help narrow the search, I wondered if anyone had a part number for the domed crystal on a 26753 02574 ?

Beyond the service manual, I can’t find any online parts reference for M25 watches.  If it’s out there would also appreciate a point in the right direction.

Thanks - Rory

[Poljot]

47 minutes ago, Rory said:

I’ve been polishing out what was a skating rink crystal on an M25, but it has a crack/blemish on it which really deserves replacing.

I’ve got some possibles on eBay, but to help narrow the search, I wondered if anyone had a part number for the domed crystal on a 26753 02574 ?

Beyond the service manual, I can’t find any online parts reference for M25 watches.  If it’s out there would also appreciate a point in the right direction.

Thanks - Rory

In this case you really do not need to waste your time searching for the part number.

Simply remove the existing crystal, measure its outside diameter, measure bezel groove diameter just to make sure numbers make sense, and order from here:

https://www.cousinsuk.com/product/domed-high-with-step-sternkreuz-hws

This is the key requirement: Domed High with Step

 

[Poljot]

And this simple and inexpensive (dirt cheap made in China) tool will be very helpful.

[Rory]

1 hour ago, Poljot said:

In this case you really do not need to waste your time searching for the part number.

Simply remove the existing crystal, measure its outside diameter, measure bezel groove diameter just to make sure numbers make sense, and order from here:

https://www.cousinsuk.com/product/domed-high-with-step-sternkreuz-hws

This is the key requirement: Domed High with Step

 

Thanks - I’d been looking at that page.

Case aperture diameter : 30.6

Crystal diameter (vertical part of profile) : 30.3

Crystal diameter (flare/step?) : 31.1

Assuming the correct reference size for this crystal is 30.3mm?   In which case, better to keep shopping, or would you expect a 30.4mm to be a workable option (evens only from this page at Cousins)?

 

Thanks - Rory 

[Poljot]

4 minutes ago, Rory said:

Thanks - I’d been looking at that page.

Case aperture diameter : 30.6

Crystal diameter (vertical part of profile) : 30.3

Crystal diameter (flare/step?) : 31.1

Assuming the correct reference size for this crystal is 30.3mm?   In which case, better to keep shopping, or would you expect a 30.4mm to be a workable option (evens only from this page at Cousins)?

 

Thanks - Rory 

31.1 is your choice!

[watchweasol]

Hi You might like this crystal reference  book to add to the collection.  I believe Cousins has also got the Sterncruze crystal manual on file.

BB_Reference_Book.pdf

[Rory]

9 minutes ago, Poljot said:

31.1 is your choice!

Ok, that clarifies which dimension, thanks.

For acrylic, given it’s an odd decimal size, is it best to walk away from ‘evens only’ options and shop for an exact fit? Or is there a rule of thumb to go up or down 0.1mm and still expect a workable result?

Thanks - Rory

[Poljot]

22 minutes ago, Rory said:

Thanks - I’d been looking at that page.

Case aperture diameter : 30.6

Crystal diameter (vertical part of profile) : 30.3

Crystal diameter (flare/step?) : 31.1

Assuming the correct reference size for this crystal is 30.3mm?   In which case, better to keep shopping, or would you expect a 30.4mm to be a workable option (evens only from this page at Cousins)?

 

Thanks - Rory 

30.3 is "good to know", but irrelevant. 31.1 is slightly larger than 30.6 - this is what you need. Good to go!

[Poljot]

3 minutes ago, Rory said:

Ok, that clarifies which dimension, thanks.

For acrylic, given it’s an odd decimal size, is it best to walk away from ‘evens only’ options and shop for an exact fit? Or is there a rule of thumb to go up or down 0.1mm and still expect a workable result?

Thanks - Rory

Go with what you measured: 31.1 seems to be a perfect fit for 30.3-ish bezel opening. When you have doubts - get slightly larger one as you can easily file the edges. But you nailed your measurements!

[Poljot]

And please do NOT ignore this advice

[Poljot]

1 hour ago, Rory said:

Thanks - I’d been looking at that page.

Case aperture diameter : 30.6

Crystal diameter (vertical part of profile) : 30.3

Crystal diameter (flare/step?) : 31.1

Assuming the correct reference size for this crystal is 30.3mm?   In which case, better to keep shopping, or would you expect a 30.4mm to be a workable option (evens only from this page at Cousins)?

 

Thanks - Rory 

Great photos, btw.

[JerseyMo]

The Timex dial code is the key value - 26753 02574 .  You must either have the small booklets provided to service centers or the full parts distributor book. The small booklet will map to a envelope number in those blue plastic bins commonly found for sale eBay. Whereas the distributor book will map to the Timex part number used at the factory. The two ( envelope number, part number) can not be cross referenced. Also, the distributor books are not cumulative year to year.  So you must have  a series of books that cover a range of years.  That is unless you have a inventory such as myself. I already know I do not have the crystal anymore as it was used on many other cases besides the one shown.

 

[Rory]

1 hour ago, JerseyMo said:

The Timex dial code is the key value - 26753 02574 .  You must either have the small booklets provided to service centers or the full parts distributor book. The small booklet will map to a envelope number in those blue plastic bins commonly found for sale eBay. Whereas the distributor book will map to the Timex part number used at the factory. The two ( envelope number, part number) can not be cross referenced. Also, the distributor books are not cumulative year to year.  So you must have  a series of books that cover a range of years.  That is unless you have a inventory such as myself. I already know I do not have the crystal anymore as it was used on many other cases besides the one shown.

 

I doff my cap to you sir - many thanks.  I shall be purchasing generic crystals either side of the exact size (can’t find right now) and seeing how they squeeze/rattle in.

[JerseyMo]

I keep a generic supply on hand - 30.2 30.4 30.6 and 30.8. They are good for mid 1960's to early 1970's Marlin mostly. Not always correct fit but I'd say the better percentage of times I get them to work.

[FlyerFry77]

On 1/4/2021 at 8:31 AM, JerseyMo said:

The Timex dial code is the key value - 26753 02574 .  You must either have the small booklets provided to service centers or the full parts distributor book. The small booklet will map to a envelope number in those blue plastic bins commonly found for sale eBay. Whereas the distributor book will map to the Timex part number used at the factory. The two ( envelope number, part number) can not be cross referenced. Also, the distributor books are not cumulative year to year.  So you must have  a series of books that cover a range of years.  That is unless you have a inventory such as myself. I already know I do not have the crystal anymore as it was used on many other cases besides the one shown.

 

That is quite a stash! Might you perhaps have a crystal for a 98950-07378? I believe it is envelope 42?