This is a NEW-OLD-STOCK, ROLEX 5 1/2 Lignes BALANCE STAFF (for movement diameter 12.0mm 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. (Ref – AFTR42c).
The S&H WORLDWIDE, is €4.00 for a Standard Priority Airmail Postal Service.