This is a NEW-OLD-STOCK, ROLEX 10 1/2 Lignes BALANCE STAFF (for movement diameter 23.5mm approx) : Suits early REBBERG & some later models).
Stock comes from a closed down Watchmaker. See pics for example and size. The container shown indicates the product type but is not part of the sale. Height is listed at 3.2mm- (Ref – AFTR42).
The S&H WORLDWIDE, is €15.00 for a Registered (& signed for) Priority Service