The good thing about the Webley spring pistols is that they are very easy (and quite cheap) to service. They don’t generally need anything doing to the piston as they use a ring seal, much like in a car engine. All you’d usually use to get one up to speed is a spring, seal and some SAE30 (or similar grade) motor oil. You can do a complete service in about 5 minutes. If they’re in reasonable condition they will still last a lifetime. Sears can wear over time, but can be replaced. By all means ask what they’d take. If there is a batch number stamped into the end they’ll be post war, if they have a serial number stamped by a grip (and plain grips with no Webley logo) they’re most likely pre-war. Either way they are a good fun pistol.