Some of those Model 1300 Turkey guns were engraved or the stock imprinted at the factory, usually with the National Wild Turkey Federation logo which is (yup, you guessed it) a turkey. (Some owners thought the gun was a turkey as well, but that is another story.)
NIB, the one actually called the NWTF model sells for a bit more than the regular "turkey gun", some $425, if the right buyer is found.
Jim