8-10 in. Crescent wrench

[Northwoods]

Bought a nice older plain steel double ended Crescent wrench yesterday (just under 3/4" thick) and would like some info.  Forged into handle:


8-10 in.  CRESCENT  DROP FORGED/STEEL

MADE BY CRESCENT TOOL CO.  JAMESTOWN/NHY.U.S.A.

What I am really curious about is the forged in markings just below the adjustment wheel on the big end:  H8-10-6

I don't see forged in markings on other Crescent wrenches.  I can imagine that H represents the double ended style, and 8-10 represents the size, but could the 6 be a date mark? 
Any thoughts?

[d42jeep]

I've never seen a date marking on a Crescent wrench.
-Don

[Northwoods]

I hadn't seen one with a code either.  But I found these on the bay; one with a stamped code, and one with a forged in code.

https://www.ebay.com/itm/Vintage-no-39100-1-4-6-inch-Double-ended-Crescent-Adjustable-Wrench/401725882450?hash=item5d88ba8052:g:JPgAAOSwb2hchHH3

https://www.ebay.com/itm/Vintage-Double-Sided-CRESCENT-TOOL-CO-6-8-IN-Wrench-MADE-IN-USA-JAMESTOWN-NY/264206273340?hash=item3d83ebcb3c:g:da4AAOSw7ttcbY-M

[d42jeep]

I found these Friday at an estate sale. I finally figured out that the stamping meant that the wrench was formerly the property of the local water company, EBMUD.
-Don