Indentifying Year of 322 with out serial tag

I was looking at a John Deere 322 recently and it is missing the serial tag on the side. I was wondering if I can possibly find the year it was made with the engine serial tag, or at least get close to the serial number if someone else has a close engine serial number? Anyway the engine serial is: CH30220006612 any one have a 322 with an engine serial number close to this one?