John
Go to this link here it will tell you how to determine year.Also lots of good info on that model.I had a L2900 W/FEL we used 6 days a week in a plant nursery type business.For its size and weight it was practically indestructable.When we sold it,it had almost 3000 original hr.s on it.
Boone TractorData.com Kubota L2900 tractor information