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Tom,

Yes, it would be nice to have his HIN and/or Stencil number so we know what year he has for sure.

The first Tan interiors on the 13 were built in late 1972 (1172) as 1973 year models.
http://www.whalercentral.com/articles...cle_id=101

May not even have an HIN but most likely it would be embedded on the outside of the transom if it does have one.
Similar to the last photo in this article:
http://www.whalercentral.com/articles...cle_id=103