Serial number dates your 65-1 to 1977. The other stampings are in-house S&W codes denoting things like who fit the gun, inspected it, etc., and are of little significance outside the factory.
The hammer indeed looks like the larger, target variety, or possibly a semi-target size; it isn't the service hammer, which the 65 usually shipped with. The trigger does not appear to be target variety, but instead looks like either a standard service trigger or possibly a combat trigger. Check to see if it has serrations on the face.
Hard to say more without further pictures. An unusual hammer-trigger combination, nonetheless, that didn't normally ship from S&W that way. Could be factory, could be someone switched parts after. The red ramp front sight, too, is uncommon on the 65 from the factory, though not unheard of.
It's impossible to meaningfully assist in assessing value without more information. Cosmetics can't be determined from one image, but require multiple quality ones from several angles. Mechanics we can't determine online at all, but the following links can help you to assess mechanics and condition and report back here:
The National Firearms Museum: Evaluating Firearms Condition
https://docs.google.com/file/d/0B6Fh...hl=en_US&pli=1
In general, a Model 65 that is in spec, mechanically sound, and cosmetically well-preserved, with original grips but no original box, cleaning tools or documents, is a solid $450 to $550 gun on the current market, depending upon vagaries of seller, buyer, region and shifts in the breeze.
Value drops from there if cosmetics and mechanics are lesser. If the 65 is in "perfect" condition and has all the original factory items it sold with, value jumps.
They're superb all-purpose, no-frills revolvers, too.
Keep us updated and we can help determine value whether you want to sell or simply know what you have.
Lastly, welcome to the forum.
Model 65-1
Linear Mode
