As Bruce says, definitely WW2 German! I have found plenty identical to this. The wrap is a spiral plastic and absolutely of the period. The Argus flexible hose connecter is a standard fit to all Luftwaffe aircraft of the period and stamped NW followed by a number. The number denotes the size of the fitting I believe. From memory, I thought smallest started at NW6 and they go up to quite a chunky size – but Bruce may know the range. It may be that the numbering isn’t size related, but just the fitting number.