Herman,
You inspired me to look through my blue and red books. Like you said, nothing in the blue book pertaining to this.
However, the red book shows a picture of a #3 hammered chrome skillet marked H.S-1053 on pg 20. Size difference and size marking aside, it's a mini version of your #10.
I double checked the listing of Wagner catalog numbers in the red book and there are no designations marked HS. There are listings for S-1053 (size 3) through S-1064 (size 14) chrome plated cast iron (Silverlite) skillets.
I'm guessing perhaps (maybe possibly) the HS might mean Hammered Silverlite, but that's probably too obvious.
Clear as mud, huh?