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It has a significant dip near the toe as you described. And there is no sign of any other markings.
It looks like the one in the bottom on your picture. It also have the same cut at the pivot end of...

Thanks a lot Thaeris and Voidmonster for helping me out.
I was suspecting around the end of and beginning of 1700 - 1800.
I also thought that The Clapperton would be from Sheffield, but the Paris I...

Hi.
I just recently got two oldies that I can't find any dates on. One is only marked Paris and the other one is marked Clapperton.
The only Clapperton I can find was an explorer, and I don't think...