The Tintype Mystery

Uploaded for the Vintage Photos Theme Park theme of: PICK A PARTICULAR FORMAT (daguerreotype, cabinet card, CDV, real photo postcard, cyanotype, slide, Polaroid, or what have you?)
I've chosen a tintype but it's like no other I've seen.
I don't really collect tintypes, although I have quite a few at this point - but, first of all this (and it's companion) is the largest I own (or have seen) (6 1/2 by 8 1/2) and secondly, I can't figure out how this was done.
It's on the usual dark tin - but it's like the original tintype photo was cut out, enameled, put on again and ...re-photographed? Or something.
So... if you run your fingers over it - it's rougher than usual tin on the front with a completely smooth enameled portrait, and the normal smooth brown/black on the back.
Any ideas? And is that a mourning tie?
Below is the companion photo - same process and size. Both are lightly hand-colored.
She looks older that the man to me - perhaps his mother? Or maybe just an older wife?