This machine is definitely a 1972 model, my neighbor had a 2297, which was the same machine, but the power mate did not have a headlight. The second digit in the 4 digit code designated the year, and the last 2 were the series, the higher the number the better the machine. The height adjustment on this power nozzle was ridiculous, the pedal only raised it, and at the highest position it was almost 3" off the ground, to lower it, you stepped on the top of the power mate and it made a loud stripping sound, it was kind of crude, most kept it on the lowest position anyway. The attachment holder was moulded in the hood also on the 2297 and it did not have the maxi filter, it just had the regular round filter. There was other differences that I can't seem to remember.