I bought this sign direct from the London Transport Museum on an open day at their Acton depot about 15 years ago.
I'll be donating 50% of the sale proceeds to the local miniature railway at Eaton park here in Norwich as they give alot of joy to families on a Sunday.

this sign measures 71x24x27cm and is a proper sign from the London transport network. stove enamelled body by AJ Well.
glass sign with 'assistance and excess fares' text.
the case opens and can be backlit - you'll need to confirm the wiring is safe - please assume it needs new internals completely.
The case hinges open but I can't remember how. you'll have to have a go.
a few marks but it'll clean up well.

I'll post this in the UK mainland, but it's 14kg and will require alot of packing and protection. eBay won't let me set the postage service costs at £30, so I've had to include some of the postage costs in the overall sale price.