These are catalogs, price lists, and ads for that I've found on the interwebs. It's probably not of interest to most people, unless you happen to be into vintage acoustic guitars. Where possible, I have linked to the original source, but admittedly some of those sources may have been lost. I don't own any of these images, nor have I created them from the original materials, unless otherwise noted. It's curating, plain and simple (i.e., that's a fancy way of saying "reblogging").
1915 Gibson harp guitar
This image was found here.
1933 Martin OM-28 ad
This image was found here.
1972-1974 Martin catalog
These images were found here.
1970 Martin catalog
These images were found here.
1957 Martin price list
These images were found here.
1941 Martin catalog
These images were found here.
1935 Martin catalog
These images were found here.
1930 Martin catalog
These images were found here.
1926 Martin price list
This image was found here.
1924 Martin catalog
These images were found here.