RAF oxygen tube / connectors, early pattern

Standard early war pattern corrugated rubber oxygen tube complete with a brass plated Mk.IV (6D/526) bayonet connector and cadmium plated crocodile clothing clip.  These early tubes are significantly narrower than later war examples and were standard fitting on the E-series masks and also used on some early issue G-masks.  This example is fully flexible and has only very minor cracking within the folds/corrugation.  No splits or holes and in very good '+' used condition.  Significantly rarer than the later war tubes.   Stock code O23125.