Thanks for the link to that video. I learned some new stuff about that arm!
Would include a link here to where I posted photos of the Navy BP arms I've got but since Photo Bucket messed with their 3rd party hosting none of my old posts with photos show the photos now. Eventually I'll find another service and fix all the links.
This weekend i will work on posting some photos directly to this thread of the Remington Keene I've got with Navy marshal markings.
Scout