Karl,
Rifle No 424 was sent to Derbyshire Police on the 14th August 1974.
Rifle R32823 does not appear in the records, although as I have said previously that does not necessarily mean the rifle is a fake as there are some gaps in the records. The best option would be to post a lot of detailed photo's of the rifle and ask for the opinions of the likes of Roger Payne and Peter Laidler.
Cheers,
Simon.