This is the red fibre gear that was fitted to the magneto component of Lucas Mag/Dyno Units and was original Lucas Part Number LU463109 or 463109. This gear is 58 tooth.
These are nicely made items from a trusted UK supplier, the quality of the fibre material and the cutting of the teeth looks just as per the original.
Attached is an exploded diagram of a Lucas MagDyno showing where this gear fits - it providing the drive from the magneto to the Lucas dynamo, which has a smaller metal gear. Therefore this fibre gear is almost 'sacrificial' - i.e. it designed to take most of the wear . . . and often because of that, showing a lot of wear (they can also attract grit and dirt if the dynamo has been off for a while - I have a Lucas magdyno mag (minus dynamo unit) that has been sat on the shelf of one of my storage areas for at least 30 years!).
Price is Each.