This is the early Remington pump .22 which is chambered for .22WRF (except that Remington, of course, called it .22 Remington?...if I remember correctly, the 22WRF is available from some supplier or another these days, but is really expensive, so the rifle itself would not be very desirable, compared to the common .22LR version.
I don't know whether it could simply be re-barreled for .22LR, or whether the carrier and/or other internal pieces would have to be changed as well....
If simple re-barreling would make it a useful .22, I'd guess someone would likely think it worth, say, $35-ish, possibly $50-ish if its really pretty looking, with nice wood.
cheers
Carla