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Ray, I showed only some facts from some sources, plus a little bit logics and my opinion. History is inexact science. :)

I think you know American W.R.Case company. And they made knives and razors with stamp "W.R.Case & Sons, Germany", 1900-1915. :)

For example, because it's import.
There are many such examples. The razor was made in Germany and sold in America via American company.
On the forum you can find a lot such examples.

No, I think it was made by John Chatillon. But XXTRA stamp is very interesting.
Scales like bone.

It's not a problem.
The J.Dixon Cutlery Co. Germany was from Sheffield. :)

Hmm ...
But interesting fact, stamp XTRA was used by The J.Dixon Cutlery Co. Germany in 1920's. James Dixon & Sons is Sheffield company and still in business since 1806.

This is New York company. The founder was John Chatillon. The company was founded about 1835. The company is still in business, but discontinued cutlery about 1937.