Interesting tube steel type/recipe. SDH-MT may not be a fan of the thread but here are additional images of Andrew & Co. LTD steel:

http://www.doublegunshop.com/forums/ubbt...true#Post176769

.... http://www.gracesguide.co.uk/wiki/Jno._Hy._Andrew_and_Co

http://www.doublegunshop.com/forums/ubbt...true#Post200594

For now I can't make out the mark at the end of the tube steel type but my 1st guess would be Jean Falla but I can't say. Also there appears to be a set of initials just aft of the forend hanger which might point to a maker. Jean Falla may or may not have been involved but here is a link to his known trademarks thanks to PeteM: http://www.doublegunshop.com/forums/ubbthreads.php?ubb=showflat&Number=225724&page=2

Kind Regards,

Raimey
rse