I have what I think is a first batch BSA number 1569, in reasonable condition. I replaced the spring with an Airsporter one, (slightly shortened), and re-did the leather washer with neatsfoot oil, it is a .177 and is running at. 9.5ft.lbs, and it's quite accurate with Superdomes, and a joy to shoot. Not bad for 110yrs old!
BSA First batch, Breakdown, Cadet major, Meteors, Mercurys, Airsporters, Supersport, Superstar, Lightning XL, HW80, Logun S16 mk1, Webley Junior rifle, Relum Tornado, Webley mk1 pistol, ASI Centre pistol, Crosman Medalist 1322.