I am curious what other members think about differences in valuation of various years of production in 4-digit serials for SP1s:
Would a gun in 1xxx serisl range be worth more than a gun in 9xxx serial range, and if so by what percentage?
Is there a difference in valuation between 1965, 1966, 1967 and 1968 made 4-digit guns, assuming the same condition?
Thank you!

there haven't been enough sold in a time period in similar condition to really set a baseline.  at auction, anything can happen.  we've seen later ones in worse condition sell for more than earlier ones in better.  all it takes is 2 guys who want to get in a bidding war.

earlier is always more desirable in terms of serial number and production year.

I don't know that we can easily quantify how much difference there are in values, but if we assume we're talking about rifles in similar condition, here are some general rules:

3-digit guns are worth a premium over 4 digit guns.
4-digit guns manufactured in 1964 and worth a premium over those manufactured in 65 or later years.
Guns with "early" features (like the Edgewater buffer, early gas tube, 3-prong FH, early-marked barrel, etc.) are worth a premium over those with later features.
The more early features, the better!