NEW TO FORUM WTB 1995 V-21 NEED HELP

Inspected the boat today. On a rating of 1 to 5 with 5 being excellent, I would give the boat and outboard a 3.75. Three years ago he paid $ 15,000 which included the trailer. I mentioned to the owner that I thought the boat was worth between $ 5,000 to $ 10,000. He thought the number was low. I wait a week and see if the boats still for sale.

How can you determine the year of a Yamaha outboard by the vin number?

Gentlemen, thank you for your imput!