Jim, that rifle is so good it's still produced and sold today. The FWB has a serious cult following, also. BOTH primo airguns. At that age, they very well may have leather seals, I am not savvy enough on either to be sure. , BUT...this won't hurt, even if they're synthetic.

You have to cock each one open to expose the tiny air transfer port. With a can of Ballistol, and it's red straw attached, put a short spritz at each of the four cardinal points of the compass, or clock-face. Let that internal 'puddle' soak into that leather seal by resting them with the muzzle skyward for several hours. Then, try a pellet or two to release the spring tension. Prepare for a sloshy dishcharge, and maybe some extra noise. Then, rest them muzzle down for a day, to let any excess drain. Swab out the bores, and try shooting them again.

http://bakerairguns.com/ knows those backwards and forwards, also.