Still have a throat mike in a box of junk in the loft. First used a couple from a war surplus shop near Leicester Square when at school, as cheap experimental guitar amp pick-ups. Used one briefly when flying chipmunks and Austers at Elstree @ 1961/2 with large padded earphones, but soon swapped to trad leather helmet with comfy shami leather lining plus mask for mike....all from that same shop. Much later, a colleague, briefly before joining Caledonian, used a throat mike when 'freelancing' on Mig 17s in Africa....sort of a quaint match for the bits of canvas showing through the tyres that he mentioned..