Jacob Adler & Co. (Adlers Gloves)
A glove manufacturer in New York State, this ad is seen as early as 1906 in the
Polo Grounds RF grandstands. Not much to go on other than a 1912 postcard, a 1917 sales order, and previous recreation attempts in
another forum. I suspect a form of this banner was used in all the deadball NYC parks.
Add: I don't believe this Polo Grounds photo is from 1906. More likely a few years later or even the Polo Grounds IV.