Bob,
I'm fairly certain that he can't have been naturalised, as his English wife was naturalised long after his death (1886) in 1919 (I have copies of the application and the London Gazette citation).
The only record of him I can find pre-1871 is an IGI baptism entry for an Adam Hanisch in 1853 in Koblenz. The name, date and place fit but I can't be 100% sure that it's him. I would really like to know if he came to England on his own, or if he came with his parents, and whether they match up with the IGI entry.
Regards,
Adam