A few years ago, maybe 10, Don Simonis of the BLM created a one page ID tool for just what you are asking about. I’m not sure how, but he established a timeline for the presence and absence and number of can rings.

I have it around my office and will find and send, if someone doesn’t do it first.

Mike Polk
Ogden, Utah

Sent from my iPhone

> On Nov 2, 2017, at 7:54 PM, Mills, Robin <[log in to unmask]> wrote:
> 
> Anybody know when rings on tin can bodies first showed up?  I looked for
> the introduction of this attribute on several online tin can histories or
> timelines, but nothing.
> 
> I suspect post-1950s.
> 
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