Omega Seamaster 300 165.024, 166.024 and 166.0234 case back thread angle

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May I have some help please

I have tried to find a clear case back for vintage SM 300's so it is possible to see the movement. this has been to no avail, so I am now going to try to find someone to manufacture it.The biggest problem is getting the correct angle/thread/depth for it to fit as it should.
The thread seems to be M30 x 1.0 thread ? If someone would please confirm the correct thread for a case back it really would be very helpfull.

If any member would recommend someone who could make a clear case back preferably in the UK., it would be really helpfull.
Thank you.
Max
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