Hey, i have an Edwards 1521, but it has a weird switch on it. This was used (in the 70s) with edwards 360-A flush mount horns. Those were left abandoned in the wall and upgraded to spectrealert classic devices. Anyways, this 1251-0A does not have a glass rod sensor. It has a button switch that’s open when the door is not pulled but closed when it’s pulled. I have no idea what this is for since if you pull it in the first place, it will spin the code wheel and set off the system.
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That appears to be an aftermarket button, which might have been put there to convert the station from coded to non-coded: an actual 1251 tamper switch is right where the hole in the front of the handle is (next to the protrusion that breaks the glass rod), which likely throws a trouble at the panel if the glass rod goes missing from its holder for any reason.