There is very little out there about the history of Lemmy. I feel it may take some involved digging at the library, but I can tell you that trademark records do confirm the date on the bottle. The Lemmy trademark dates to 1939 and was based in Cincinnati, Ohio. Many vintage soda brands that died off or were bought up by larger companies and later culled during the 70's and 80's and Lemmy was no different. But many of these brands/flavors have been recreated and distributed by Orca Beverages in Washington.
It has a nice fizz with an tasty tartness. I think the tartness covers the normally smooth texture afforded by using cane sugar, which Lemmy uses. This drink is refreshing and I like it enough to say I'd drink it often if it weren't only available in niche stores or online. Would definitely be welcome on a sunny patio.