I'm talking to a seller about an old Ludwig kick. I don't recall seeing this kind of internal mount before and I was wondering if someone could tell me more about it. Particularly what time period Ludwig was installing these and if they're at all common. The drum has no tom or cymbal mount and it had clip-on spurs. Keystone badge but I can't make out from the photo what era it might be.
The photos are cropped because I felt like the seller might not appreciate me putting too much of his drum out there and looking for info on it without first asking him. I just don't want to waste his time asking for a history lesson. Hope this isn't a forum faux pas.