When buying, "proven" is often better than "unique." Industry standards like the Sellita SW200 Go to product viewer dialog for this item. Soprod M100
: Needs an exact match or a compatible "donor" movement for a vintage piece. This often involves scouring secondary markets for specific calibers from ETA or discontinued in-house series. The Micro-Brand Founder buy watch movements
There are three main types of watch movements: manually wound mechanical movements, automatic mechanical movements, and quartz. Why Are Watches So Expensive? - aBlogtoWatch When buying, "proven" is often better than "unique