Custom crafted leather full arm armor by SharpMountainLeather, $174.99 -- I like the way it's put together, but I'd do it in steel or brass:
Armour -- Looks like Norton Armouries or similar.
Segmented Leather Armor Tutorial: Arm
Steam Punk Vest and Leather Armor for Ryley. January 2014.
via bloodmilk Pauldrons and Arm Braces by vofffka
Cosplay DIY Armor Tutorial | Elvish Pauldrons Cosplay Tutorial
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Leather Lace Up Archer Bracer Arm Armor: I'm not that into ren faire/period/steampunky fashion, but I could live with this making a comeback. ARM CORSETS!
Pauldron reabrace couter vambrace pieces for arm harness as they developed over the 15C.
RESERVED - Steampunk Equalist Glove arm armor. $1,500.00, via Etsy.