Mitch-if you can get the owner to shoot over the SN I can get you the date it was built. For sure it was made between 61 and 63, and it is not a super early one as there is a hole for the creeper option I see. It's value around here with a deck and running shape is ballpark $350-$400 as a guestimate. The Cub Cub Cadet though will be far easier to locate parts for than the Dynamark will be, and is certainly more valuable fixed up. The "Originals" as they are nicknamed, are becoming a bit harder to find and bring pretty good money restored. Implements are not too bad to find as well, though the originals not as easy as the rest of the cubbies.