Not great photos of gun but clearly it's the same type of gun as the Beeman Girandoni. Has all the same attributes. Marked Staudenmayer. Catalog says Berlin but we now know that Staudenmayer is London. Not sure if it's marked London or not. This is the same gun that's in Wolff and is correctly identified as London. Since Staudenmayer started in business in 1799, M. Lewis could have owned this air gun Low collection serial number indicates part of the early collection. Will have to hunt for the exact reference. This catalog was published in 1928. This means that this air gun is from1800s America and not a later import. No millionaire can own this air gun. But, when they put together the Smithsonian 200 Year Lewis and Clark celebration this is the air gun that went on the exhibit. Could it be the actual gun? Looks like a good choice to me.