the big round ones you have are not 3 speeds, are VARIABLE speed. Turn it and will find only have one click, the on/off one, and then a continuous fade up to top

the first pic is three speeds 72/74 ( not anymore variable available )... just some earliers 72 that came out with 71 switch. 74 came out with diff PN I think but same switch

I don't have in hands right now the 71 variable I have around but I'm pretty sure the longer one is 71 B body by the PN I remember.