For the record, the evergreen model 27 was made from the early 1950's up to about 1983, with variations in stocks, sights (no scope rail on early ones), breech details, trigger blades, etc., but AFAIK, all have the excellent ball-sear two-stage trigger. It might be found under any of these names:
Beeman's Original 27
Beeman 100
Condor 27 (?)*
Diana 27
Donor 27 (?)*
Gecado 27
Geco 27
Hy-Score 807
Original 27
RWS 27
Winchester 427
...and probably some I'm forgetting!
* Condor and Donor were rare names used in Europe. I don't know if these brands inclulded the model 27.
+ Hy-Score, Winchester, and RWS are the most commonly seen in the US.
+ I believe the Hy-Score and Winchester guns were exclusively in .22 cal.
+ I would guess Original (UK branding) did a fair number in .22, but that's speculation.
+ I would think most brands had some percentage in .22, but again just speculation.