This is a
Smooth Feed Dog for leather sewing machine Juki TSC-441 and other 441 clone machines including:
Toagle TCB-441,
Durkopp Adler 205-370,
Global WF 9205
Consew 756R-3
Global WF 905,
Golden Wheel CS-441
Techsew 5100, 4100
Cowboy
CB4500, CB3500