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Dimensions of Seiko 6309 stem/crown gasket

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I am fixing up a Seiko diver (6309-7290) and I'm looking to change out the gasket on the winding stem - I ordered part OK0240B0A which should be the correct replacement gasket, but it doesn't look right. Does anyone know where I can find the dimensions of the real part so I can check I received the correct one.I have searched all over the interweb but without any luck?

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I don't have the actual dimensions on hand but you can decode a lot from the part number using the Seiko Gasket Code information.  O means o-ring shape.  K is the size class, should be a 1mm cross section.  0240 should mean 2.4mm inside diameter.  The outside diameter of your gasket should be about 4.4mm. 

If these numbers are close to what you have in your hands, you should be good.  Keep in mind that aftermarket crowns have been available for at least a decade that I have been playing around with the 6309 diver.  No guarantee that the gasket area is correct on these aftermarket crowns.  

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