Vintage Pifco LED fairy lights. (Possibly the first LED xmas lights?)

I bought these a very long time ago when they first came out. To the best of my knowledge they are one of the first sets of LED Christmas lights. They're not very bright despite drawing over 100mA and with only a third being lit at a time as they chase. This is mainly because the LEDs of that era were only designed for use as indicators.
The construction of the holder is interesting. I was wrong in thinking that the LED leads pierced through the conductors. It appears they are wedged behind the leads and then pressed into a holder that grips everything together.