Well, the mystery deepens. I looked in the newest Reiss book (4th ed. that is), page 58, and there I see that my machine does, in fact, have the 2/4 minute gearing (left column, third picture from the top). Stranger still, though, I can't for the life of me figure out where the speed control is on this phonograph. It's not in the front, to the left of the shutoff switch -- there's not even a hole for it there. Now I truly have no idea what I have. (Did I mention that, prior to this purchase, I didn't "do" cylinders?) I'll be happy to send pictures to anyone who asks if it'll help. And thanks in advance for whatever information/theories you'd care to impart/share.