Probably useful and of interest to a number of folks hereabouts...
As a research monkey, I put together a selection of historically accurate, extensive download pdfs, completely systemless, for both the "Pulp" era (20s and 30s) and the Wild West. All are free, each piece presented with relevant dates, pictures, and other details useful for pretty much any rpgs.
You can download the Ultimate Pulp Gear Archive files here:
Ultimate Pulp Era Gear Archive - GrizzlyWiki
You can download the Ultimate Western gear Archive files here:
Ultimate Western Gear Archive - GrizzlyWiki
Since creating them I've amassed a huge amount of extra information courtesy of a couple dozen period catalogues featuring period prices, etc. so I can always answer questions about a lot of 1870s, 1920s, and 1930s gear, sundries and weapons.
cheers!
Colin