The Gry Maritha kit makes into a fine model and Loyalhanna Dockyard advertise
This would be for a new unopened complete kit in pristine condition.
Model Slipway made very good kits and I suspect a full kit in good condition would attract some interest from modellers.
As you are in the USA I suggest you advertise the model or put in a specialist model boat auction. If complete and in good condition I would suggest offering at $350/$400 with a fixed reserve of $300, but be guided by the auction house as they will know the local market and at the end of the day it is only worth what someone is prepared to pay. Hopefully two or more will be interested and you will receive a good price.