The HW55T is one of the most attractive and sought after recoiling 10m target springers. The T version was made from the 1950s to sometime in the 70s(?). It's a beautifully made match quality rifle and has a much superior lever latch lock up to the HW35 (sorry I.J. ), because it is adjustable for wear with a little dial visible under the breach. The HW55 was designed to shoot at normal match velocities (ie. a little under 600fps) but you can easily uprate them with an HW50 spring to get about 9ft/lbs, but at the expense of harsher recoil. They can even be tuned up to maximum legal power - I think Venom used to do it.