I think you'll find the serial number on the frame on the right side if you're viewing from the front. Just look for a rectangular plate; I know some tractors have it in very hard-to-find locations, but if I'm not mistaken, your Regent should have the plate at the location I mentioned above. If you can't find it there, look under the seat or on the body just above the hitch on the rear. Hope you can find it!
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