In the vintage area, I prefer solid metal, either steel for most watches, or 18k gold for elegant watches.
Simple reason is that, in the vintage area, it is easier to find watches with cases which are in good shape, or can be easily restored by a professional - if you target these type of cases. Surfaces can be rectified with dedicated machines, before or after metal apposition by laser.
This is obviously not possible with plated or capped.
To find an interesting watch with great dial, great movement but a worn out plated or capped is a letdown big way.
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