As some may know, I have a very strong interest in the work of HO Pioneer George Stock. My journey into learning more about George and his company started with a random GG1 find at a local swap meet in 1995. For those that do not know, George Stock started offering HO equipment in 1930 which predates all other manufacturers of US made HO equipment. I have been blessed over the years to obtain three GG1s of which one is an unbuilt kit in the original box.
Most recently, I ran across and was able to purchase one of his catalogs. This one is catalog number 9 and is dated May 1st, 1941. Having never seen one of George's steam locomotives, this catalog gives me a better idea of what to look for. In total it is 16 pages and lists lots of parts and accessory items in addition to his full locomotive kits. While I have been downsizing my collection of paper, this is a must have for my collecting interests and I hope to find more!
Note how all the items are typical of pre-war HO being 6 volt and also the options for enhanced gear ratios for a slightly higher price. Looking at the prices, these were not cheap for their time, but they do represent the state of the art for the era.