304 766 Stainless Pipe Hex Reducer Bushing Fitting 1″ Male X 3/8″ Female NPT

This is a 304 766 Stainless Pipe Hex Reducer Bushing Fitting 1″ Male X 3/8″ Female NPT as pictured. Was a a box with swagelok 316 parts. All but one are stamped 304 766