Casey: It looks to be a No.0 with "Good Two Rod Damascus"
No one on the internet can tell if a gun is safe, but there is lots of information here
http://docs.google.com/a/damascuskno...hIiY62Hx4/edit
Please be aware that 'Low base' and 'Field load' in no way assures that the shell has low pressure.
Very soon I hope to publish a series of articles which will include a cascade of evaluations for any vintage double, pattern welded or fluid steel, starting with visual inspection and ending with proof testing.