Antique post mortem ambrotype in gutta percha case

Description

I think this is an ambrotype (as opposed to a daguerreotype or tintype), as it is somewhat but not extremely reflective. The image is also very faint, and I can't quite discern the gender or age of the person. However, the length of the coffin seems to indicate that it is an adult. Gutta percha case has working hinges and clasp.