Ken,
I agree with you on the surname. I've spent time researching that alone.
To summarize that aspect... "Jordan Family History. English, French, German, Polish, and Slovenian; Spanish and Hungarian (Jordán): from the Christian baptismal name Jordan. This is taken from the name of the river Jordan (Hebrew Yarden".
It could indeed be a Germanic name. Hard to say...
The idea that it could also be an "American sounding name" for import/sales reasons sounds a little off base. I am under the impression that folks at or around the turn of the 19/20th century were more commonly know to be proud of their own identity, and their products. Not to say that "Americanization" did not occur but I believe it is a more modern aspect of life. Hard to make a call on this tho.
You may be 100% correct...
KJ,,
I absolutely understand your points on condition, age, and authenticity.
I am a marine fabricator, and life long mechanic. Restorations of wooden boats have given me a fairly "keen" eye for spotting re-worked metal parts, and I also know how to make these same parts look as new as possible without giving the tell tale signs that educated customers will try to avoid.
Knives are another magnitude of difficulty to restore/polish or fake with NO tell tale signs. Experts there are very few.
ESPECIALLY when an asking price is just a few dollars. There is no return in time/skill. Especially considering this is an obscure maker? with very little info.
The knife in question is on FleaBay right now. "OLD ANTIQUE A JORDAN CO GERMANY 4 BLADE KNIFE"
The images are pretty good.
This is more an exercise in learning for me than it is a knife I want... (otherwise I would not reveal where it was)

.
I am more interested in trying to learn how to research these things.
I really do not think this is an A.J. Jordan unless it is a very early example!?!? Perhaps a "clone" maker from that era? Again I think that idea is a stretch.
If anyone is truly interested in following this thru to a reasonably acceptable answer I can post up the links I have found referring to "A. Jordan Co"
I also found the other Jordan-s you mentioned, and none of them "jive" with what I have found.
There is mention of an "Albert Jordan" cutler from NYC as a distributer in an advert. here... (under Dicks Knives)
https://books.google.com/books?id=0J0-A ... ty&f=false
https://books.google.com/books?id=SzQ7A ... fe&f=false
Apparently Mr. A, Jordan from NYC had legal issues surrounding importing knives that he "claimed" were knives that he had sent to Germany for repair. Perhaps that made his stay as a cutler short...

Perhaps...
https://books.google.com/books?id=XVMMA ... MQ6AEIWDAJ
Perhaps THIS Mr. Jordan was indeed importing knives, and marking them? Just as the AJ jordan was doing around the same period?
If that is the case, I would love to have that example from FleaBay. Sort of a scandal piece...
There is more on A. Jordon in German records... I can find them again if wanted...
Thanks guys!
Ken Mc.
WTB Kershaw 2120 MACHO Lockback Parts knife
I need a pile side scale. THX!