Is this a solid rose gold and SS case ?

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is that a non destructive test? The acid tests I have seen I thought you make a scratch in the metal to apply the solution?

You are right, a little scratch. Best way would be a XRF gun, but they are
extremely expensive.
 
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Maybe this is the opportunity we've all been waiting for:

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https://www.ebay.co.uk/itm/276557956932
 
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I have one of these - I've been looking for a replacement dial for getting on 2 years now. I'd always assumed it was rolled gold as I haven't been able to find any hallmarks.

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My recollection is that it is 32mm.

Cal 262?