FireX is the original maker of that detector as Jameson supposedly rebranded all their detectors from other manufacturers.
Interesting…is the “general signaling switch” for use in a two-stage system or…? (is that “nut” on the left side of the right station where said switch & its cover would go?)
Another thing that’s notable I’d say is that the flip-up cover on the left station is red, has a number on it, & has empty horizontal screwholes, while the right one either has no colored plate or has it painted black, no number, & has vertical screwholes with screws.