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I traded a beautiful '69 Martin Lane with mouton to Greyhound52 recently, but my understanding is that '69 was a transitional year. This jacket looks to have a Dynel collar.
The texture appears like that of my Alpha B-15C's Dynel collar when my B-15C was new. But I've bought new mouton to go on jackets, and it has texture like that, too.
I just bought a '68 Martin Lane, with mouton, and it is that dark. The eBay jacket does look like Dynel to me, but I guess it needs to be seen in person.
We could write the seller and ask him to burn a chunk of his jacket's collar. If the smoke smells like a charred sheep and not like a New Jersey chemical fire, we'll know the answer.