Ebay Item

Looks Like a Metropolitan Line A Stock train set number box blind to me.

It is SSL and I think that it is D78 pre-refurb. Looks familiar on my days with my dad going to the Bridge...

You're probably right, my memory is terrible...

EDIT: Talking of eBay, and I know that it is BR, What's this from?
cgi.ebay.co.uk/British-Rail-Machine-Plate-/150611376126?pt=UK_Collectables_Railwayana_RL&hash=item23112337fe

Havnt a clue! But the flooring looks like Baker Streets' Jubilee platform floor lol

The flipshots of the item prove blinds!

I just find it interesting however the colour of the box and the numbers on the blind, totally different to the A stock's pre-refurb colours!

Could be off the old APTIS ticket machines.

That looks like a post refurb A60 box to me.

I've had to replace a number blind in them a few times when thrashing along the fast line. They are a right cow.

Pre refurb were worse because the wiring was shot and when you opened the number box to get to the winding mechanism it would be likely that the rotten wire to the lighting tube would either break or short out and blow a fuse.

Also the handle on the left in the picture controlled which number blind turned. These were never maintained and often failed to work.

A good idea but suffered from neglect.

Right, from the horses mouth, so to speak, from a Met Line T/Op friend -

"I can confirm that the A60/62 stock uses blinds and not number
plates. It is evident from the fact that they often get creased on the spool and end up (whatever the blind-equivalent is of) "cross-threaded" and mis-aligned.

The reason for the "ancient white 4" is simply that the 4 is always displayed and so the fluorescent pigment in the numeral "4" fades over time -- same as the BAKER ST and WATFORD particularly, on the older destination blinds".

Heres a video illustrating the number blinds from a contact

Bloody hell!