I bought a couple of HW77s off a mate in 1986, Dave.
The .22" one with a 4 X 40 Tasco scope cost me £20, the .177" one with 2.75 X 40 Tasco scope cost me £50, and he threw in a HW35 for free.
My mate couldn't get on with the .22" one so I stripped it and opened the transfer port which calmed it down --- this action now sits in a walnut Venom stock and its original stock is on my recoilless b2.
On the nostalgia kick, I've always wanted a Park RH91, I nearly bought the prototype once but it was a bit expensive just to sit and look at.
All the best Mick