I don't have the print for it with me but my guess is a mid 80's selective collective esco with I believe an a8 selector. The building has 5 of them and I put one of the interface products ip8700 selectors on one with no real issues. The problem has become interface products closed up and now I'm using a claddagh ip8300 plus. Claddagh doesn't tell you if it's still using a binary count for floor position, (I don't think it is do to magnet placement) or if you have to jump out contacts 31 to 33 on relays xf,yf,zf. Also the box they sent us doesnt look like the box in, the very minimal, installation instructions and had like 3 rows of jumpers and no information on if you're supposed to move them to get signals to the controller. The magnets on the tape I put up seem to be picking the propper relays in the box but my controller isn't seeing them.... And to be fair I haven't gotten a meter on the term strip to see if it's making it from the relay out. Or haven't checked my helpers wiring in the cartop box, but he's generally pretty good going off a pull sheet.