I have one of these unusual CRTs, it is from a flying dot telecine machine and provided the scanning light source. It seems to be used but is in it's shipping box.
It dates from 1984 and is made by Rank Cintel Ltd, they are just over 1/2 a meter long
Would make a great addition to a vacuum tube / CRT collection.
No idea what this is worth, so i am open to offers... so the best offer received by 17:00hrs UK time on Sunday 24th gets it! Your welcome to PM me with your offers or make a post in this thread.
If you want any more information on it, let me know and i'll post it here for you
Can ship worldwide at cost