I have to believe it's homemade. The font isn't the Marantz font. It's easy enough to sew these up (yeah right, more like "have someone sew these up") and then take it to a place that has one of those embroidering machines.
I'm thinking when I get all my stuff put up in my to-be-finished listening space I'll do this for all the various pieces, which means of course no stacking.