Congrats on a good purchase of an N-Frame.
Shoot and enjoy it............be comforted that if you ever want to sell it, that down the road you will be able to get more for it than what you've got in it.
They are not making anymore of these and there is a market for them. As Drew (Sebago Son) has pointed out there is a segment of collectors that are looking for the 28-3's because there were fewer made in that configuration.....Dr Pig (Saxonpig) is correct also, in that many people want a pinned and recessed gun......doesn't matter you have a desireable gun and someone else will be looking to buy it if you ever want to sell. For now shoot the heck out of it and maintain it and it will still appreciate in value.
Don