The 1st gen FXB didn’t have a button nor did the 1st gen FXW-1’s, anywayback to the FXB 2nd gens had both tiered and domed buttons then the 3rd gens had a small base just like the FX830’s.
The 1st gens had a small metal bracket instead of the more commonly seen plastic bracket.
The base on the first gen is smaller than the second gen
That’s interesting, and thanks for clarifying. But what is the difference between tiered and domed test buttons?
I found a Presto! But I’m not sure if it was already found
Here’s the link to the 3D tour https://www.homes.com/property/505-rue-chamonix-barrington-il/1k0e1z4eprxrr/
@PhotoElev I thought this was one of your top holy grails if I’m not mistaken, right?
Thats a Honeywell wireless smoke alarm for a security system. They have a voice, flame, co, heat and smoke sensor
It’s a wonder it doesn’t have a natural gas a water leak sensor 
Coincidentally I found on eBay a linecord version of the Gillette for about 95USD! I really do want one of these for my personal collection and have been wondering if I should get it
Model # 941.
Found the same one but on Etsy and it’s cheaper! However, even though the pricing is lower, it’s now two dead memes in a row, what the heck kind of birdseed is this? All jokes aside, I’m hoping I’ll be able to buy this.
That’s actually a 941CA
Oh, okay. You can’t tell that while it’s on the wall though.
Oh yeah…
That’s an actual model? Huh, had no idea. What exactly about that particular 941 identifies it as a 941CA? (& let me guess, it’s the Canadian-market model)
Is the 941CA even rarer than the standard 941?
Its been a while since this post, but I just removed three of these units if you are still looking
No idea if willbill will reply or not, but I’d say a lot of us here (including me, heh) are open to taking them off your hands for you.
Are you able to get a closer picture of it? It’s hard to see.
I think I found the rare USI that doesn’t have the ring around the horn and it’s cheap too! Standard Universal SS-770 Smoke and Fire Alarm General Purpose | eBay
Aren’t those really common? I see them everywhere if I search up universal smoke alarm.
They are much rarer than the variants that have the ring around the horn