Here is a shot of my NOS switch.

I have owned many 3 ADs and more TFs than I can remeber and they have all been original 6 cylinder trucks. I have never run across the 3 position switch before. So this one is new to me, with the 2 offs and one on position. This switch does not have an accessory position.

Hey Denny, sorry to here about your "NOS" fan. This switch is how all NOS parts should look. I picked this up from Tom Meyer in Oklahoma. Great guy, I got several hard to find parts for my 54 hydro truck, from him.