You are talking about a Gillette Old Type, which does have a very small blade gap. That razor was designed to use different, thicker blades than today's DE blades. Many users of this type of razor shim it to achieve some more gap, and also fiddle with the tension on the handle. Your statement does not apply to any other model of razor that I am aware of.
The model I'm familiar with is a Mercur. Possibly there are several styles of open combs. I am only familiar with this one.
With all this shaving, I've got thick skin. Tell me which parts you disagree with. I've had my OC for many years, though I only use it rarely. It sounds like your a regular user.
Sorry. The Merkur open combs are basically a clone of the Old Type. Again, the razor was designed so that the user would adjust the tension of the handle to increase the gap. That pretty much doesn't hold true with any of the other OC razors I own or am familiar with.
I can actually see where broken teeth on a razor would be a deal breaker. I have a 1912 that I bought which was once given to someone for their birthday. It had a note that included the names of all of the people that helped pay the $1.00 that the razor cost with the warning that it would be repossessed if not used. So back in the day having to replace a razor with damage may take a much lower priority than say, keeping food on the table.
Yeah, these days you never think about how different times were back in the day. I look at it now like buying a Blackbird or King Cobra. Can I justify spending that much when I have so many others to choose from. On a side note, it was a 1901 Gem not a 1912. If you want to see it, look at this thread.