Original Singer Top Hat Cam # 1 Arrowhead 172185 Fits Models 401, 403, 411, 431, 500, 503, 600 series
-Original Singer top hat cam
-Cam number 1
-Part number 172185
-Arrowhead
-Fits Singer models 401, 401a, 403, 403a, 411, 431, 500, 500a, 503, 503a, 600 series touch-n-sew