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Where did you read that some of them were made of gold? Apologies for being the bearer of bad news - but it isnt. It seems to have significant water damage, which removed the rose gold plating, revealing the base metal. Just a cal 751 in a not paticularly well shape. For value as-is, see ebay sold listings. I'd guess 50-100€.
Solid gold dial not movement.
What you have is pretty junky.