Coconut canteen marked HRE 42

Textbook issue coconut canteen marked HRE 42 indicating production by Heinrich Ritter, Esslingen. The canteen is in very good condition and is complete with its original cup. The bakelite drinking cup is a rare black example with a large 3X/S MPD-code. For more information on these canteens look at my article here; https://fjm44.com/articles/the-coconut-canteen-ritters-mystery-canteen/