Thanks Danny...I'd completely forgotten that old bit of my blather, lol!
A couple minor notes to add - the early Beeman imports were actually marked "Beeman's (not "Beeman") Original;" and a couple other brand names used were "Condor" and "Donor." I believe the former was on some oddball European-market models, and the latter by a Dutch distributor.
The model 50 was manufactured for over 30 years, sometimes with multiple variants available simultaneously, and with many evolutionary changes in stocks, sights, brand markings, and other details. You can see a great selection on Danny's "Vintage Airguns Gallery" site:
https://forum.vintageairgunsgallery....iana-model-50/
As to how an "RWS model 50" ended up in the UK, who knows! My guess would be a solo US-market example rather than a special edition...but I've been wrong plenty of times before! I'll look forward to seeing pictures of it.