This is likely a simple one, so bear with me.
Should 3-ply Ludwig bass drums have reinforcement rings?
I know eBay isn't the place to learn something new, but while looking at a few listings I've seen drums without reinforcement rings being described as early '70s Ludwigs. These ads are likely put up by people who are uninformed or possibly trying to get on over on an unsuspecting buyer, but I'm just curious if there was any point in time where 3-ply bass sizes weren't getting rings.