Yeah, kinda has to be in that time range. Maybe Ed Ball can tell us when the batch of "Mutes" started on Gretsches, but I would think that it would be late 1961 or early `62. I did see one #6122 around 1971 that was Tennessean Red, white outlined decal "F-Holes" but No mutes. It belonged to Stephen Stills and he used it on that first electric solo tour with his band and that tour was mid 1971. I remember seeing it at my friend Neal Moser's home/shop as Neal was working on Stephen's guitars at that time..