Gillette Blade Blank, Canada 1930 (?)

Hi All. Try as I might, I could NOT find a reference to this blade case which I bought at a market yesterday for peanuts. It was badly corroded, but I used a paste mixture of flour, salt and white vinegar and coated/left it overnight with really very good results. 

Other than a reference on the Razor Emporium site (below), I could not find another example of this case anywhere online. Anyone help me here? I have a few blanks, and other than looking just great, they come in really handy to complete sets provided you know which set they come from. 

Razor Emporium page (note they say there is a thumbhole underneath: there isn't):

http://www.razoremporium.com/1930-gillet...rrencyId=3

Here are my pictures, but they don't properly catch the deeper brassy tone. Note the LONG arrow (and my dirty thumb) 

No clues then, chaps?