Gentlemen,
I just purchased a Marsh and Bros. etched with an eagle, "Epuribus Unum", and Pond works on the shank. Interestingly, my ancestry and razor hobbies crossed and I found a link to razor manufacturers in Sheffield in 1834. You will notice all of the Big Boys and some of the Little are all here. I will post pics of the blade as soon as I get home.

GENUKI: Sheffield Directory of Trades and Professions for 1834

Scroll down to the razor manufacturer bit and you will also notice they double up for different items produced throughout the list