For those who like looking at and reading old magazines, Guns Magazine now have the August and September 1956 issues on their site for free download.
http://www.gunsmagazine.com/1956issue.html
On page 51 of the August issue you can see an add for a Luger snail drum magazine for $8.97. Next to it are some holsters for just about the same kind of low price. You need a PDF viewer such as Adobe Acrobat to read the magazines, but they are worth it. I wonder if the Goodyear Zeppelin Rifle Club still exist???