What year was it initially purchased? That is the year if you wish to assign a year to it. Tractors tend to be distinguished by model, a given model is made for a chunk of service years, and when the manufacturer updates the model it will be assigned a new model number. Think B2650/LX2610 and B3350/LX3310. Generally the same tractors, but Kubota updated the line and fixed the B3350 engine emissions issues, then changed the name to LX in an attempt to disassociate the new model from the failed history of the B3350. The LX2610 and B 2650 is really fresh new lipstick on the same old pig. Years don't matter, model and hours on the clock is all that matter.