Starrett A2 Air Hardening Tool Steel No.54619: 3/16" Thickness X 6" Width X 18" Length Mallet Edestaal was the supplier of

Edestaal was the supplier of Unimat Lathe Accessories and Parts in the day

These back plates come wrapped in plastic and covered in heavy protective oil

I am told they were made in the 1940s

Directional:

Starrett A2 Air Hardening Tool Steel No.54619: 3/16" Thickness X 6" Width X 18" Length Mallet Edestaal was the supplier ofStarrett A 2 Air Hardening Tool Steel No. 54619: 3 16" Thickness X 6" Width X 18" Length 3 16 x 6 x 18", AISI A 2 (497) Flat Stock. AISI A 2 5% chromium air hardening steel features high wear and abrasion resistance. Maintains close dimensional accuracy throughout the heat treating process. The wide 75 hardening range makes this virtually foolproof. High wear resistance is also ideal for punches and dies to stamp silicon, stainless steels, monel