Doesn't exactly answer the original question but my mind was jogged......about three years ago I decided that I REALLY REALLY REALLY NEEDED a couple of the 'everlasting matches', I actually sent for 5 at a cost of under £4 from China. They arrived and were filled with petrol (lighter fluid) and that was the last time I saw or used them......I just dug two of them out and tried them and they both struck beautifully first time and both reservoirs are still full of fluid, not sure how good they would actually be if they were to have been carried around for that length of time but certainly as emergency 'matches' put somewhere 'to hand' they certainly seem to be useful.
DB.
DB.