The first projector I remember at school was the B&H 545 Autoload. That was when I was in 4th grade. They had those through the rest of Elementary, and in Jr. High. The Elementary also had a Kodak, and Jr. High also had a Graflex. I helped in the AV room in High School, and we had several B&H projectors - a 545, 552, a couple 1545's, and a 1552. There was also one Singer Graflex. The HS had a 20' wide Cinemascope screen in the gym/auditorium, with connections to the PA system. This is where we usually saw special rented movies around holidays. We saw "Psycho" one year, but it was the TV print. Another time we saw "The Thrill of it All" with Doris Day. They usually rented 3 per year. Never any Disney titles - rental too expensive.
My Aunt Doris and Uncle Joe had a B&H, I think it was a 1552. I tried to talk my parents into getting one, but they weren't about to spend that kind of money for something like that.
About 20 years ago the school had a surplus sale, and had several included. There was a nearly new looking 1592 I wanted, and a nice 2552, but I had to leave for a dental appointment before they got to those. I asked my neighbor to go as high as $30, but each sold for $40 or $50.