ezman, a few points to note:BSA / Lincoln Jeffries were the original developer of this type of underlever tap-loader, around 1905. Later in the 1930's the same design was copied (most shamelessly in the eyes of many Brits) by both Diana and Haenel. There is no connection between these makers and BSA.Looks like you found the photos posted on Danny Garvin's vintageairguns gallery site. You may have noticed there were some variations in stock style and minor details on these guns. I would expect to see a price in the $300 range for a nice example, similar to what BSA's go for. They are easy to work on if the piston seal is ruined, as long as the action itself functions properly. You didn't mention what the asking price is??Prices on eGun for pre-war airguns seem to be extremely high - it may be that very few were left there between Allied souvenir hunters and gun-destruction orders.Best of luck!Don R.