Hi David,
"LV6/MT13 FV.171207 Bolt cotter C/W chain tailboard"
Post War British ('cause of the FV number), the tailboard in question will belong to a Humber one Ton. In this case FV 171207 is actually a drawing number, not a part number, but refers to the key on a chain setup that keeps the tail board in the closed position.
Any other FV Spares????
I suppose the amp meter looks like this?
http://www.ebay.com/itm/NOS-1940-Che...item564d9f41b9
Rich.