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Can anyone help please?

I have a wrist watch marked " KEP ( in a diamond shaped box ), 17 Jewel, Shockproof " which is missing its back cover.

A snap fit, the diameter is 27.8mm.

Where can I get a replacement.

Any advice is much appreciated, Thanks

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There are no numbers or marks on the case.

I think it's just a cheap watch made of brass, I was hoping it would be gold but no luck.

It's of no real value.

I'm just after a cheap back to fit and was hoping someone would know of a supplier of generic bits.

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What we need is the inside measurement of the case opening and outside measurement of the case. I happen to have a box of case backs and therefore you might be lucky. PS where I got them from I just don't know, probably eBay. 

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