Please help to identify odd green glass bottle

I found this bottle in the woods in the suburban Chicago area, which also happens to be on the site of a German POW camp during WWII. I’ve tried scouring the internet for any info but have come up with nothing. There are no marks at all on the bottom. Also, it’s difficult to tell what the letters are on the front (G&N? G&M? G& the Pi symbol?)

thanks much to anyone who can help!

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