Cohen and Abramowitch, I think. I believe the firm was started by two Jewish refugees from Tsarist Russia somewhere around 1910. They probably decided that two obviously Jewish surnames, one of which sounded Russian as well might cause problems, or that C&A would be cheaper and easier on note-paper, not to mention on the phone.
C&A can still be found in quite a few German towns, as can Woolworths - the latter only a shadow of its former glory
Arghh!! Moving house and conveyancing frustrations