Just got this last week and I have to say that I love it - the design and build quality is wonderful. Interesting maker and interesting time in British history (rather like now!). I've seen a few single train versions but the two train versions seem quite rare. Two train versions are larger and all brass - I read in 'Clockmaking in England and Wales in the Twentieth Century' by J Glanville and WM Wolmuth, that the single train ones have some brass plated parts. I got it in pretty good condition but it was quite tarnished and dirty and needed some TLC. I did what I hope is a sympathetic restoration which keeps the original spec and some patina / character. I learnt how to re-black the chapter ring (my first attempt) and used shellac as the final finish to protect the brass. If anyone has the crown shaped key which goes with this clock let me know.