this is from:
Mike's
http://www.oldtechnology.net/colour4.html
and to quote:
"This next colour set is a 1958 (roughly) Ekco CT100M. I bought it from a great chap called Danny from Norwich for a small fortune, but it is a fantastic set and worth every penny that it cost my Barclaycard. The set is an experimental colour receiver which was originally designed and built as a 405 line NTSC set, but was subsequently factory-converted in 1964 to 625 line NTSC and then again later in 1965 to PAL-S (Simple PAL). The cabinet is very typical of mid 1950s design and there are several different valve lists attached to the back indicating all the different design changes, although they're all stuck on top of one another so it is quite difficult to ascertain any real data regarding the modifications the set has had over the years. I have carried out a fair amount of electrical restoration and the set can now display a half-decent colour picture, but there is still quite a lot to be done to make the picture perfect. I'll post some more information and pictures of this set when I have some."