Re The Question of Case Hardening Skeleton Butt-Plates, Toe & Heel 'Protectors',Steel Butt-Plates....I have a collection of aprox. 60 Toe & Heels 5 or 6 Steel Butt- Plates,at one time,many many more, but have Re-Stocked, both Guns & DB. Rifles over the last 'Quarter Century' and have used them to add some'Victorian Flavor'to the new stocks.I have found the 'Bitish made,(and German, Belg. Austrian,also) have been'Hardened' A few of the'Lesser Expensive Guns'mostly Birmingham made, left the Steel Parts in the 'Soft'.On a pair of Boss 12b'Hammer,Ejectors, Side-Lever Guns, c1890,Only 14 built,Ref. Donald Dallas Boss&Co.Book.After I had Re-Stocked them back to 'All Original Dims; I Fitted 'Toe&Heel'Protectors to each gun.(Supplied by'Dakota Arms'in the white.) After Re=shaping them to the Orig.Boss Pat. Barry Hands Engraved them to Jack Sumner's original Pat.I contacted several 'Experts'( Or as Mr Brum'Jack Rowe calls several people'EX-Spurts')'Were the Original Victorian Steel Parts Case-Hardened, or left 'Soft &Blued'??I Case-Hardened T&H pcs, &screws, Polished back to'Boss-Bright' then had Turmbull 'Blue'. Of the 'Many' Parker'Skels.Ansley H Fox Skeleton But-Plate(ONE) that I've been 'Privileged'to have on my Work-Bench, there has'nt been one that I could'nt put the'Graver' to, or File out for Upgrading(or Down-Grading) Do we know if Parker Bros. ever hardened any of these Units???? As to Longevity of engraving on Steel Butt-Plates,I have Purdey #208c 1819, & Joe Manton db c 1813. W.Greener,perc.c1829-35, All well used Engr.Still there. I just checked 5 other Parker Skeleton B/Plates,a couple with traces or original engr.all 'cutable with graver'. I have a G&H New York Bolt Rifle c 1930s,Steel Butt-Plate,Engraved,Blued,.."Diamond-Hard".I wonder what the 'Rockwell" is on the Galazan Fox Engraved 'Skel/B/Plate' is???Then of course we have Parker No168304,The C**r's gun I recently 'Stripped Down" and examined,I did'nt check the Skel/B/P did notice the Engraving was a little 'Thin'.Maybe someone will give some discussion to this Question?? cc