I worked for a Telphone company for 33 yrs, I have two or three older pay phones that we called triple slots with rotary dials, one chrome and two blacks or maybe it is two chrome and one black (Kellog and ITT brand) as well as several older regular phones that I would sell for the highest price i can get for them now They may have worked a long time ago but they were what we call pre pay phones, you put the money in before dialing, the later ones like in the picture above are post pay. You pay after they connected. The ones I have are very old,40+yrs or more
PM me if interested and we can discuss them and I can send you some pictures of them to let any one interested getting one