Finkenstadt & Kaufmann, a soda water business, apparently started in the mid-1920’s. They were listed in the 1924 Brooklyn Queens Telephone Book at 235 Broadway and between 1925 and 1928 were listed at 34-11 7th Avenue. They were not listed in the 1920 Telephone Book or in the 1922 Copartnership and Corporation Directory for Brooklyn and Queens.
It’s not clear when the business ended but the fact that I’ve never seen one of their bottles on the Internet makes me think they weren’t around much past the early 1930’s.
Census records lead me to believe that William Finkenstadt was one of the proprietors. Born in 1890, 1910 records listed his occupation as a driver for his father’s mineral water business in Manhattan. In the 1930 records he was living in Queens and the operator of a mineral water business, presumably Finlelstadt & Kaufmann. By 1940, his wife Helen was listed as a widow, further indication that the business most likely ended in the 1930’s.
Seventh Avenue was renamed 36th Street in Long Island City but I’m not able to relate the former business address to a current location.
The bottle I found is machine made (27 oz) which fits with a mid to late 1920’s manufacture date.