With any "collectible" class of product, including of course knives, many issues that guide a person's purchases go out the window. Al Mar knives have a big collector following. Some collectors will devalue a Non-NAM knife while others may not care at all. If there is a price difference it would depend entirely on the individual collector.
Your picking up the $25 One Hander knowing the origins of the knife/design represents one type of buyer. While a collector of AGR branded knives would pay $100 for the marked one, and that's another type of buyer.
BTW, this is one that I wouldn't mind having. An AGR One Hander with the blade made by Ichiro Hattori in Cowry-X Damascus. I'm sure it wouldn't be cheap though.
Your mentioning Pat Crawford reminded me that I bought one of his boot knives from him directly in AR back in 1980.
Letter, telephone call and check, pre-online ordering...lol.