WW2 Flashlight WIF Signal Restoration

I bought this World War II German / Austrian Flashlight on a Fleamarket.
The model is WIF Signal 1136. The WIF Signal flashlight was made in Austria in 1938 and widely used by the Wehrmacht/Luftwaffe. The flashlight is having a red and a green color filter.
If you have any questions about the process, machines i'm using or other stuff, just ask me in the comments. I read them all and i try to reply as soon as possible.
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#WWII
#Flashlight
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[@giblingonojor3415]

this is actually better then the big channels

[@ethanshalev9760]

i just got the exact same flashlight I want to restore. What kind of battery did you use and how does it connect? Any info would be great. Loved your video

[@aikothefrench68]

They used a 4.5V battery. You can see how to connect it to the flashlight on UA-cam !