T-42 Mortar sight box

Came across this in the old house. My Uncle was in artillery. Too bad the srtap was cut off.

https://www.milsurps.com/images/impo...sjcmcgif-1.jpg

https://www.milsurps.com/images/impo...reifwcf4-1.jpg
https://www.milsurps.com/images/impo...lzu2apqu-1.jpg
https://www.milsurps.com/images/impo...zsrolroz-1.jpg
https://www.milsurps.com/images/impo...uytb4y4q-1.jpg

Same ones we had in the SF kits...with the little prismatic sight inside. We never used them, instead we used the big sight we used on the 81mm.