I was looking around on Google Maps, and found this short-horned (pre-1972) ACA Allertor in Prague, Oklahoma. Since the early ACA Allertors were offered in all port ratios ever offered in an Allertor, you can't be sure of port ratio just by seeing a short-horned allertor, and there aren't any videos...

Where can I find said "audio recording" of the Marcin Park B&N Mobil Directo?

The Mobil Directo that remains in Mequon (by North Shore Country Club) was disconnected in 1985. It started up out of nowhere, and it kept sounding until the city got there (2 hours later) and cut the wires. Here is a link to my video: QHh6ixpyREg Here is a slideshow I made before I knew the “story”...