British Railways Signal Box Track Circuit indicator

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A BR standard Track Circuit Indicator from a Mechanical Signal Box. Plastic or possibly Bakelite case and back , I cannot see any cracks or significant damage although there is a ring of what appears to be sticky tape residue around the rear of the case, which should remove easily if required. The wires have been cut and I cannot confirm that this is working or not, not sure how to test it or even the voltage. 24v?? I dont want to risk damaging it but cannot see any reason why it should not be in full working order. The banner certainly tilts from Clear to Occupied depending on the angle of the complete unit. Perhaps someone could advise?? Thanks.It weighs in at over 1 KG so P+P Royal Mail First Class Recorded will be £7 Im afraid. Happy to Combine P+P wherever possible.Collection will be fine too for this. ELR??Hi, this is confirmed as working, 12v passed through briefly, all wires are "live," the banner operates via two of them so presumably the third is the return.