I've been working on this one for a customer over the past few weeks. It is a Canadian made model 1200, made in 1925. Note the unique IBM logo on the dial, one I haven't seen before. It prints day of week, hours and minutes, with PM highlighted with a line under the hour. It is a 6 hroizontal column in/out, with a daily card used (the carriage doesn't go up and down, this was an option). The day indicator has to be manually shifted daily with a knob on the left side (it is not connected with the typewheels). It has a lock on this function as well as one on the horizontal card shifter (uses same key as the case lock). The card in the clock indicates it was installed October 9, 1925. Serial number 2510103 confirms date. It measures 46 inches tall with a 1/2 inch dial.