Post your # … someone will be able to look it up… You might also post the rest of the model # L4150 should be followed by some letter or letters… KennyV.
The L4150 was sold from 1985 thru 1991. In those days Kubota warehoused a number of tractors of each model and assigned model years to them as they were sold from inventory.
Machinery Link lists the several L4150 models with years. But not by serial number.
Tractortips lists some serial numbers and gives model years, specs. I couldn't nail down the serial number you listed - but my guess is late '80s. If the tractor is the newer brighter orange it may be a '90 or '91.
If you call Kubota in Columbus, OH 614-492-1100 and give them the serial number they can tell you the date it was first sold at retail and even the customer's name. (Not sure they're still doing this - haven't tried it in a while)
Cheerful refund if info is bogus.
Take care, Dick B