I thought all the black monsters were 300 model's. Now I see some extra options including with and without safelight output. With and without buzzer. PM me as to features you need. I have several sitting here.
They've obviously changed through the years. Original two prong AC, grounded, plastic case & there's a 60sec. enlarging variety too. The 60 sec is a different model # but unless you check the data plate, they look the same.