Re: winchester 22L
I am about to start my own thread on the model 72 so here's what I can tell you from doing my own research. I just purchased one today but I haven't picked it up yet for pictures. I paid $275 for a model with a pristine bore, a very slight handling mark on an otherwise nicely figured walnut stock and pretty good blue with just a few freckles. Original peep sight and no holes that don't belong.
Bear in mind that was retail price from a guy who I like and has given me very good service, so I've never once haggled with him on price. I probably could find it for less, but I willingly pay more because he backs up what he sells.
Those pictures aren't great but the gun does not look to be in pristine condition. My eyes may be playing tricks on me (see my thread) but the bolt handle appears to have been replaced and the stock appears to have been refinished. I'm not trying to insult your gun - it sounds like you have a very cherished memento from your dad.
Now the history lesson:
The model 72 was made in two distinct ranges: 38-war and postwar until 1959. It was not a terribly popular gun because other manufacturers had very good competing products. It is considered by many to be a very accurate, well designed gun of sturdy construction.
There are two different versions: the 72 and 72A. The 72A being made later had a few improvements, most notably the lifter which feeds the round from the tube was changed from a sandwiched metal construction to a solid construction. The approximate age can be determined (anecdotally) by comparing the layout and typeface of the stampings on the barrel. There is a very interesting, very long thread on the history (complete with good pictures of many specimens) of the gun at another forum. PM me and I will send you the URL.