You are bidding on a vintage AC double-action mechanical fuel pump; it is a commercial rebuilt, item # 4701; flange is stamped P/N #4657FF; old shelf stock from a closed retailer.  It will fit several years and models; many 1959-1966 Chevrolet 283 V-8 engines, maybe others; please check your application before bidding.  Never installed but it has some surface rust from sitting for many years.  The original ragged box is included.  Although it was rebuilt sometime ago, it should be refreshed with new gaskets and rubber parts that are compatible with today's fuels.  This is a great item for someone who works with vintage fuel pumps, excellent for parts or rebuilding.  Original AC part, not late model China junk. Shipping is FREE for USA 48 states ONLY.