Very unusual, aluminium-based equipment- ie. wash-tag (ie. 'Wasch-Marke') bearing the unique numeral: '670' and superimposed text: 'Luftfahrtforschungsanstalt Hermann Göring'

I recently found five - fully identical! - examples of the unusually seen, aluminium-based equipment- ie. wash-tags (ie. 'Wasch-Marken') all five bearing the unique numeral: '670' and superimposed text: 'Luftfahrtforschungsanstalt Hermann Göring' all five pieces coming in an overall nice- (albeit clearly used- ie. worn-), condition. These square-sized tags (sized: 3,2 x 3,2 cms.) were very popular amongst the troop for obvious reasons but did not see wide-spread usage: the five tags originate from a private household in Germany and belonged with certainty to one soldier who kept these as a souvenir of the past war for years. I decided to sell them per single tag. I deem that these interesting little equipment-items would merit further investigative work!

Code: 46729