CALIFORNIA. SAN FRANCISCO. Shares of $10. brown. No 236. Folds. Formed San Francisco, 1911/2. Unusual vignette of an expanding bit: a bit or drill made adjustable for holes of various sizes; one which can be expanded in diameter while boring. We suppose this was a tool for the California gold mining industry.
Themes: GOLD & SILVER MINING, METAL & ENGINEERING
Date: 28 October 1912
Startprice: € 50