My Grandmother gave me a few razors that belonged to my Great Grandfather and I wanted to see if anyone could give me a little history lesson. One has Challenge Razor Work, Bridgeport on the blade and is in fairly good shape. The next one has Robeson SureEdge Rochester NY. I like this one because is has what looks to be a serial number on the tang as well. The last one has Genco on the tang. Any history would be great.