Vintage Singer sewing machine bobbin case, compatible with the following industrial models: class 31 (with the exception of 31-19 & 31-20), 44-10, 44-12, 331K and 431D. Good vintage condition, clean and rust free but may have some minor darkening similar to the example shown. Original, genuine Simanco part #62740, may be stamped on the interior or exterior of the case.