Rare Smoke Detectors

Okay this is all very sudden and exciting.
So I was bored in class so I decided to scroll through Realtor listings in my area, and decided to look at this house. 21789 Rausch Ave, Eastpointe, MI 48021 | realtor.com®
While browsing, I didnt think there would be anything, until I looked down this hall:


At first I thought it was just a First Alert sa76rs/rc, but then I looked closer…
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Not a Single Side vent!
Plus, the house is from 1974…coincidence?
Compare it to this only example of an ss74ac.
2053_5742_29ca0951e4055921b103e5915032b1e9_118817606_4273866755988083_7711594607324758981_n
I dont know about you, but to me, that looks the same.
I decided to email the realtor of that house, and surprisingly, she answered almost immediately.
2054_5742_c25994e4fc7348090ffb9412ba93eeae_Screenshot (11885)
I said I could talk on the weekend.

I, and most of the people on my discord server, are very excited about this, because maybe, after all these years, we have finally found the ultimate Holy Grail of smoke alarms. An honest to goodness SS74R. (or an ss74ac, whatever.) Lets all hope that we have finally found it. Also, why me?