Trench Art Engraved Aluminum Case with Nudes Inside wooden block houses In which case

In which case

I rather like how the blue-green mass at left arches over them like a giant wave though

and I'm not entirely sure what all

like an arched window

Trench Art Engraved Aluminum Case with Nudes Inside wooden block houses In which caseHard to photograph this one due to the shine, but quite a treasure I think a trench art piece, mid 20th c. I believe, which I believe would have functioned as a cigarette case, with a strap on side of the interior for holding them in. The hand engraved exterior is fun man in loin cloth with stallion as if straight out of a romance novel on one side, young woman with beach ball on the other but it's the erotic nudes on the interior that really make it;