I have the Ron Copper 1982 built specifically for me while in London in 1982, photo in this thread. The serial number is either 342 or 842. The #3 is very rounded so I am leaning towards the #8. Hope this helps those seeking a year model. I recall that his typeface changed late 1970's and know that typeface (for his name on my bike) was used on models as far back as 1980 when the LBS I worked at was selling them. I also believe that this was the last incarnation of those changes. Some of yours definitely are pre-1980.