Little value I know but I didn't have one so I picked this up from a market stall for half the £80 he wanted but probably still 4 times too much

https://imgur.com/gallery/sLC5I6s

Picture makes it look a little cleaner than it is, spring is much stronger than I expected compared to Diana type and probably not a good thing, trigger heavy too. I don't know if someone in the past put a stronger spring in, if even possible but screw heads do look like it's been apart.
Never mind didn't want it for target shooting just wanted it to pair with the Diana's