Mark I remember it well.......When I started pole fishing in 1976 there was extra fine (about a no. 1), fine (no. 2), medium (no. 4) and strong (no. 6). We did pretty much all our fishing with fine or medium. At the end of the pole we had a pole crook with 12 to 18" of elastic dangling below that. Each rig had its own elastic.
My 76 comment was a little out as I now remember. I bought my first pole before my first trip to Ireland and that was 1979 I used that with a crook, it was about a year after that it must have been 80 or so when the beaded elastic was shown to me.I was still using the pole crook in 1984; in 1985 switched to the quivertip with eyes then in 86 finally got a PTFE bush and internal elastic.