49.7mm in diameter and 18.2mm thick at the body. The dial has light patina. ROACH SAN FRANCISCO , CAL. Not sure if it works. The case appears to be nickel silver or some time of silver plate. Havent been able to find one like it. Could be rare if not uncommon. Please check out my other auctions for other fine vintage & antique watches and collectibles. The item “ANTIQUE J. ROACH SAN FRANCISCO COMPENSATED POCKET BAROMETER AIREYS SCALE” is in sale since Monday, December 23, 2019. This item is in the category “Antiques\Science & Medicine (Pre-1930)\Scientific Instruments\Barometers”. The seller is “adtpcs” and is located in Glendora, California. This item can be shipped worldwide.
