Ènclosed a few pictures of the rifles I bought. I pulled a couple out randomly to get a photo. I'm not sure if the final digits of the 1938 rifle are hand stamped - if so they have been well done. The 1920's MkIII* is definitely a hand stamped job.
Addendum - as per Thunderbox's remarks mine also show some commercial production parts, indicated by the BSA 'Pylarm' on the top surface of some of the bolt handles & on the knoxform.
In spite of the wear & neglect they look to have been very well made rifles.