Gold capped cases are anywhere from 8 to 12 times the thickness of gold as most gold-filled cases. More information here.
http://users.tpg.com.au/mondodec//GoldCap.pdf
Unless it has been horribly over-polished you should have no problems with a gold-capped case.
Here's my pink gold capped Seamaster Calendar. Cal. 353, Ref. 2627.
Enjoy,
gatorcpa
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