Singer 66-1 presser foot thumb lift with screw.  Needs cleaning and polishing but works fine. May work on all 66 Singer machines but made for 66-1.. Singer # 32536 "Presser Bar Lifter"

Note: Works on Singer 66-1, 66-3, 66-4 and 66-5  only

NOT listed on 66-8 , 66-14, 66-15, 66-18, 66-24, 66-16  machines. Those have 66564 singer number.