What is museum quality?

I have a M17 Binocular with case.  I see striations in the right side that go from 0 - 20 in the vertical and also some across the bottom with no numbers.  I am going to assume that this is some kind of ranging system.  Are there any instructions available in their use?

Here's  the picture from my "English" copy.    

Thank you for posting! Nice Zippo that would probably be considered as “trench art”.

Not hardly an expert, but it sure looks “right” to me, even down to the “Ruptured Duck” patch.

Hello and welcome. No worries on your English. I’m sure it’s better than my attempt would be to speak your language. Start posting your jump wings photos!

Attended a French flea market this morning and picked up this US Army semi bullion USAREUR/SHAPE patch knowing that US military was in France until 1960s

. More about Poole Harbour.   A few years ago I posted a photo of a gravestone in Lymington town cemetery, it featured a gravestone dedicated to two Australian brothers that probably served at the Australian 210 Squadron flying PBY Catalina's out of Poole Harbour, which gave them a love of the local area and a wish to be buried here.  So here's the possible connection between the squadron, Catalina's and the headstone.          Norman D. Landing, Forum Normandy Correspondent,  July  12  2O25.    ...           

It’s a Firestone liner.