Share 'Seeking info on 1865 coffee advertisement'

I have a one sheet advertisement flyer for The East India Coffee Co. 154 Reade Street, NY advertising "Kent's East India Coffee". From the names of prominent names I have been able to conclusively date it between 1863-65. I haven't seen anything this early when I have occasionally checked coffee advertising auctions. I haven't been able to find any additional info. on the company. Two questions...