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Gottlieb Hammesfahr was a very well known German company that manufactured steel and stainless steel items. Some of their commercial products include utensils, straight razors, and the famous swords and daggers of the Third Reich. As you could imagine the company reached its apogee during the 30s and early to mid 40s.
It is my understanding that the company didn't really recover from the onslaught of WW II and it ended up being absorbed by its big brother ThyssenKrupp Nirosta (ThyssenKrupp Nirosta: Home)
As a curious note, the ornamented top of the Chrysler building in New York City was built using Nirosta stainless steel.
Today, Gottlieb Hammesfahr products are really looked after -specially utensils. The two razors that are in your possession date from 1935 to 1944. I would say that the first one you sent photos of is an early 40s model, while the last one is mid to late 30s.
I hope my info helped.
Preussen555