I recently purchased a .30 Carbine NM Blackhawk. Trying to determine what the value of this gun is. From the research I have done, it is roughly from 1974 or 1975. I would appreciate any insight to the value of the gun. It is in pretty good shape, no large scratches or anything. some wear marks on the cylinder that look to be from typical usage. a couple very small blemishes on the wood grips and that is about it. Thanks in advance!