Original KNR4 price check

I am fixing to sell my KNR4. It is NIB with a shipper and not one of Lipsey's. I am usually able to figure a value, but this one is giving me trouble. Does anyone know what I could get for it? Thank you.

I found this on the internet. RENE says there were 300 or less KNR4s produced.

...JImbo

The latest RENE price guide had the original KNR4 (non Liberty marked) came in at $615 NIB. This is a 63- prefixed gun. I've estimated about 1,700 of those made. Then the Liberty marked version (around 300 made, all with a 64- prefix) came in at $950 NIB.
Chet15