Today, the start of deer season, I remembered that I had the gun, so I decided to take a look at it.
It's a Benjamin Super Air Pistol, model 137, .177 cal. It looks like http://www.airgunwriter.com/benjamin-130-web.jpg, except this one has a white marbleized plastic grip instead of wood. It's still in the box, with a tin of pellets and an envelope of darts. Unfortunately, the instruction manual seems to be missing.
I did a Google search, and according to the serial number, this pistol was made in 1965!
I took it outside and fiddled around with it and figured out how to use it. The pump mechanism was very hard to work at first, but after a few tries, it started working smoothly. And surprisingly, after 41 years, it still holds a charge!
Unfortunately I can't find any instructions online, so I'm not sure how many times it's safe to pump this thing or what will happen if it gets over-pumped.
There was way too much wind today to try any target practice (the wind kept knocking down the cans I was trying to use as targets), but I could at least hit the broad side of a barn (literally!) at 50 yards and I could plink a bucket in the middle of the yard about 20 yards away.
Standing around in the front yard, firing off a pistol (air or otherwise) would quickly earn a visit from the cops back in California.