Help locating Case gasket

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Hi -
I have inherited a solid 18k Constellation pie-pan and I am trying to locate parts based on the reference number but there seems to be very little information about this particular pie-pan.
The reference number stamped inside the case back is 1685416 (see photo). It is a caliber 564. The gasket was a melted mess and I need a new one but I don't trust myself trying to measure and order and thought by posting someone might be familiar with this model and know the right gasket.

Any help with be appreciated.

 
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Did you check this thread yet?

Edit: Sorry, I just looked and saw that your watch doesn't have a Swiss reference number. Presumably a British market case. You could try a gasket for a 14393, which looks superficially similar, but I really don't know if it's the same. I think a watchmaker would be your best bet, because most have a good stock of gaskets that they can fit.
 
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2
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0
Did you check this thread yet?

Edit: Sorry, I just looked and saw that your watch doesn't have a Swiss reference number. Presumably a British market case. You could try a gasket for a 14393, which looks superficially similar, but I really don't know if it's the same. I think a watchmaker would be your best bet, because most have a good stock of gaskets that they can fit.
Thank you, Dan. I think I will take your advice regarding a watchmaker. And I love learning about this watch and Pie-pans in general so was glad to see you provide information I was unaware of (British market case) and will need to look into further.