This is a good part removed from a Mercury 50 HP,  3 cylinder, 2 Stroke [1B157737].  The motor was run in freshwater only.  This will fit many Mercury Outboard applications - please check your application before purchasing.  Note: sale is for both carbs - they may need a cleaning before use but look to be very clean inside bowls - see pics.  Stamped WM-13-1 and WM-13-3, 1379-6071.