Russwin later merged with Corbin Cabinet Lock Co. and since is known as Corbin.
The #'s indicate the depth cut from tip to bow or head.
I might have some of those exact blanks, as I am a locksmith and every once in awhile I come across those locks. My best guess would be 20's-50's
Corbin makes MANY types of blanks with different groove configurations.
Hope this helps.
Scott.