That old BRB film of a day at Waterloo had shots of the old wooden Solari working
I had more than one obscure contact with this.
Must have been mid-1970s that the old wooden board (Southern railway vintage?) was replaced by the new Solari. The engineering contractor who did the replacement, Wickens of Chertsey. who had doubtless been responsible for disposal of residuals, actually advertised the old board for sale in the Railway Magazine.
Some years later I had business contacts with them, and mentioned I remembered this. Actually not a complete memory, but I had been thumbing old magazines a short while before and noticed it was them. The engineer from those times said that it had been sold to a "dealer" almost the day the magazine had come out, much to everyone's surprise. It had been a considerable nuisance in their builders' yard and they were glad to be shot of it.
On I went, and life moved on to Los Angeles, California. After a while there we went to a restaurant in Hollywood that had opened up called "Victoria Station", first of what later became a chain. Dining was in old BR carriages, in blue/grey, which I later discovered were the remains of the rather chaotic Flying Scotsman USA trip of some years earlier, along with lots of other railway memorabilia. Anyway, into the restaurant entrance ... and there, pride of place, was the old wooden Waterloo indicator board, huge, dominating everything. Inevitably set to nonsense combinations, which I pointed out on the way out, to be told "Yeah, whenever we get British train buffs here they always say that". So that's what happened to it. The restaurant has long gone, I'm afraid I presume the board was scrapped when the site was cleared.
I don't think Mr Solari had any connection with the board.