Forty years ago, retail prices:
Colt Government Model .45, $92.00.
Smith & Wesson Model 19, $140.00.
Smith & Wesson Model 29, $190.00.
Colt Python, $190.00.
S&W Model 36 Chief Special, $85.00.
Of course, 40 years ago most of us couldn't afford most of these things! I was on the police department, taking home $192 every two weeks, with two kids to feed and a house payment of $181 per month (paid $17,700 for that house, brand new, 3 bedrooms and a 1-car garage).
New Ford half-ton pickup trucks could be had on sale for about $2600. I bought decent used cars for well under $1000, and my credit union provided 3-year financing so I could keep the payments down to about $35 per month or so.
Cup of coffee was 5 or 10 cents, depending on where you went (Sambo's, Denny's, IHOP, etc). Gasoline fluctuated between 18 and 35 cents per gallon and, while a $10 bill would easily fill the tank and bring a handful of change, no one I knew could afford to buy a full tank all at one time.
Draft beer was a quarter. I used to treat myself to one now and then, maybe a couple of times per month. Otherwise I bought 6-packs for around 89 cents.
Good quality firearms are pretty good investments, but I'm not sure that today's prices reflect investment performance that has exceeded inflation over the years.
Bottom line: a buck just ain't what a buck used to be!