The 1632 model had 12" front wheels and the 1630 had 8" front wheels. That would be a good stsrting point. The tractor serial number i believe is on the left frame rail about midway. The Engine model code and type number is on the top of the air sheild to the left of the spark plug. I'm sure that someone else can give you more info about the differance between the 1631 and the 1632.
There is a lot of information on this web site if you would care to member!!

Ron:

Thanks for the heads-up on the serial numbers. I found out my 1632 is actually a 1980, not a 1970!

And I have put the check in the mail to Mike Hamper. I look forward to being recognized as a member very soon!

Tom

ps: I have a LOT of questions on this new tractor. Hope the members won't get tired of my inquiries.