I've seen the name, I've searched the name and I've googled the name. All I see is with reference to CMON razors.

Found a Peter J Michels "Spear No. 12" at an antique shop and would like to know more about it. Its got a red arrowhead on the "front" tang with the word SPEAR inscribed in the arrowhead and "Peter J Michels Inc" on the first line and "Brooklyn,N.Y." as the second line on the opposite side.

I've seen No. 11 all over the place, but never a 12.