They certainly look like 'bojack' hose ends for certain 1970's & 80's lux cylinders and select upright tool kits.
Could be handy depending on wether their useable. Could you put one under your coat the next time your their and see what the issue was? If their 37.5mm rather than 32mm then obv. there's your problem!
If they just screw onto a chopped hose then they could work for a quick and dirty repair on a machine. I remember snapping the hose handle on my mums Tango back in the day and buying a numatic cuff and bent end to make it work again!
