Most stamps found look like this one above, without a gap between the ‘R’ and the ‘W’, however the first example has it. I have not found this on black PVC and since the stamp also serves as the title, what would one call a stamp-less copy?
Source: Apart from saying that it looks like a 1978 until Japan Tour (May of ’79) set list, I have no idea. If you know more, please leave a comment.
Here’s a flyer found in an auctioned copy. The concert advertised here took place in ’78. I would guess that a past owner added it after acquiring this bootleg. This could be an indicator that the releases by this label were mostly sold in the Seattle area.