Vintage Military War Japanese Trench Periscope Binoculars No 113 15x50mm Navy

Description

A really nice piece of vintage Militaria
Trench Periscope Binoculars
I want to be completely transparent about this vintage piece. In all my attempts in researching this piece I could not find another one like it. I do not know the exact date of manufacturer and the only script appears to be Japanese. I am completely confident that they are Vintage and Original
In addition to the lettering it is also stamped No 113 and has a symbol of an upside down triangle and another symbol of a triangle with a symbol inside that looks almost like an anchor, this symbol had me leaning towards this being Navy but I am not certain
On the left side it is stamped 15 x 50mm  and  30 degrees
some additional symbols/letters on the adjustment screw on the side of the very top
They are fully functional, they have chips in the paint throughout, a slight dent in the top of the left side and a small chip in the material around the left eye viewer, I have included photos
This piece is much heavier than it looks it weighs 10.5 lbs
At it's greatest points it is 15 inches tall and 10 inches wide
I absolutely love this piece, it has made for some conversations with family but I would like it to go to someone who can love and appreciate it. I originally got this piece from a Northern California collector who passed several years ago. He served in the air force as a pilot in the 60s and 70s and was an avid collector. I do not know where he originally acquired it.