My Canadian friend who's sending me the Arnolds and Eclipse received this pen in the lot from his sister, and neither of us knows nearly enough about old CBHR pens to ID the tning.
It's from the 1910's-1920 or so. There were hundreds of manufacturers churning out pens like this and even some of the big name makers were sending out pens like this for 'self branding' The steel GP nib is most likely junk. Drop in a nice 14K nib and go for broke with it. Looks like it'll clean up well & make a great daily user.
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Tu ne cede malis sed contra audentior ito ~Yield not to misfortunes, but advance all the more boldly against them