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When was it built?

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It was built in 1974 I would guess. The 0073 model was the first of three. The 720 was marketed from 74-81. The later models improved the front end. steering, seat, and transmission lockout. Another way to tell the year is look at the sn of the engine. It will have a sequence in the sn which can be decoded easily. For example 0974 means the engine was built in Sept. of 1974. The PTO was usually factory but even if added later it is the same parts; but Not likely that the 3pt is added on. I have SN 1362 so this is a close relative.

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