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Tissot PR50 gasket - Hard red plastic watch case back gasket - right way round?


Blewitt
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Hi

I suspect this is a very basic question form a rank amateur but surprisingly there is nothing on the net to help with this......

Tissot PR50 watch has a snap on case back and whilst changing the battery I took off the case back and the red plastic gasket fell out and rolled around the desk before settling down. I know that some of these gaskets have a specific cross sectional profile and therefore they may have a right way and a wrong way round when refitting. However, looking at the gasket it seems to be a uniform square cross section. I don't want to try and press the case back into place without first ensuring that I have this gasket back in the right way round as if I get this wrong I am likely to distort the gasket.

My questions therefore are - 1) how do a tell which way round the gasket should be installed?  2) should this hard gasket be replaced each time the case back is removed (seems far more robust than your average o-ring)

 

Regards

 

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1) Never saw a gasket that is different on each side but I won't contest that it's not possible. I would say, most likely, that yours is a standard gasket and can be fitted each way since you said it looks the same on each side.

2) Gaskets should be replaced only if they're damaged or worn out. One should last for quite a few years. I believe the red/green ones are slightly better quality than the standard black ones.

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One of the outer edges of the gasket,has a slightly curved edge. (Examine with an eyeglass)This edge acts as a guide edge,when fitting. The caseback should best be fitted to the case ,using a case press. So the pressure is equal as you close the back.

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Hello everybody,
I'm new here. 
I found this conversation and I thouhgt maybe somebody could help me.
I have a Tissot - 1853 PR50 - J376/476

Diameter (without crown) 36mm 

I would like know which one is the proper Gasket O-Ring in order to repair my watch by myself.

I would like to know the diameter of the o-ring gasket and the thicness of the rubber. 

Thank you very much beforehand. 

Thank you,

jomanser

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Dear Simo2,

First of all, many thanks for your reply.

Here you are a dropbox link where you can see the inside the back case of the watch (it is not from my watch, I found it in the Internet)

https://www.dropbox.com/s/aoyvi56i94sekf6/interior.jpg?dl=0

Another one with the dial:

https://www.dropbox.com/s/wn439r30na308wu/20190407_043019.jpg?dl=0

and another one with the back case with the model Tissot - 1853 PR50 - J376/476

https://www.dropbox.com/s/1x0f3wf7guxj5t5/20190407_043132.jpg?dl=0

thank you very much beforehand

 

 

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Dear Simo2,

First of all, many thanks for your reply.

Here you are a dropbox link where you can see the inside the back case of the watch (it is not from my watch, I found it in the Internet)

https://www.dropbox.com/s/aoyvi56i94sekf6/interior.jpg?dl=0

Another one with the dial:

https://www.dropbox.com/s/wn439r30na308wu/20190407_043019.jpg?dl=0

and another one with the back case with the model Tissot - 1853 PR50 - J376/476

https://www.dropbox.com/s/1x0f3wf7guxj5t5/20190407_043132.jpg?dl=0

 

xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

this is the web page where I found the first image with the back side without cover:

https://www.ebay.ca/itm/TISSOT-PR-50-QUARTZ-WATCH-STAINLESS-STEEL-NOS/264201694803?hash=item3d83a5ee53:g:XXMAAOSwHVdcaHQK

you can see on the other images that this watch model corresponds to mine

xxxxxxxxxxxxxxxxxxxxxxxxxxx

 

thank you very much beforehand

 

Dear Simon2, 

 

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guys ! i need that case back gasket please, im repairing the same tissot j376/476T and it´s a nightmare to find it to say the least. I have found that the size of it is 30 mm diameter x0.62 x0.75 (U372000868), is this correct? where can i find them, i dont see them anywhere on the internet. 

thank you!

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On 29/01/2021 at 16:40, ange said:

guys ! i need that case back gasket please, im repairing the same tissot j376/476T and it´s a nightmare to find it to say the least. I have found that the size of it is 30 mm diameter x0.62 x0.75 (U372000868), is this correct? where can i find them, i dont see them anywhere on the internet. 

thank you!

Try here...Cousins UK, one of the largest UK watch and clock part suppliers.
https://www.cousinsuk.com/category/watch-gaskets

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