Although there’s no location embossed on the bottle, I’m quite sure Marshall & Co. was a short-lived New York City soda water manufacturer. In fact, the year 1866 embossed on the bottle could be the only year that the business was in existence.
There are only two directory listings that I can find for the business. The first was found in the 1866/1867 N.Y.C. Copartnership and Corporation Directory; the other in the 1867 New York State Business Directory (likely compiled in 1866). Both listings include the same address in lower Manhattan, 182 Thompson Street.
In further support of this supposition, the only advertisements I’ve been able to find for the business were all published in the New York City newspapers during July, 1866. One ad, found in the July 20, 1866 edition of the New York Daily Herald, was a collection of three adjacent items, each touting their Sarsaparilla as well as something called Mingo Beer.
Another, published in the July 12, 1866 edition of the Herald, identified hotels, saloons, fruit stores and the family trade as their targeted market.
Similar July, 1866 advertisements also appeared in the New York Times and New York Tribune.
The subject bottle is a pony with an applied blob finish that almost certainly dates to 1866.