I have had a few like this and a few with the ray skin over the years. Chinese and Tibetan dealers that I've bought from don't make any distinction between them, it's all khampa, but that doesn't necessarily mean there isn't some intentional difference beyond variation of style. The style of this particular example is usually a little heavier, less ornate, and shows hard use compared to the ray skin.
I've always noted the similarity to the Chinese eating knives with chopsticks.
-d
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