Trinkwasser Backpack Water Purifier paper The Whiting & Davis label

The Whiting & Davis label inside has a patent number 78124 which dates to 1929

but nothing too obvious

It is in good overall condition with only a short cut near the bottom and a couple small holes

but is rather wrinkly

It could be refilled and used

Trinkwasser Backpack Water Purifier paper The Whiting & Davis labelOriginal Trinkwasser backpack water purifier unit. These are fairly hard to find, especially stateside. It is in good condition, many of these are very rotted away due to the type of metal used in the construction. The lower box which would have contained spare filters is relatively free of dents and wear with no holes. It retains most of its original gray paint. The The handle moves freely but I am not sure if it would still pump. The ceramic filter