Austin BT12 spanner

[bystander]

I would suggest the one to copy is the 'Terrys' aftermarket pair. These were widely available through all the cherished suppliers (and generally in the motor trade) for years. Unfortunately they were discontinued a while ago, but would be easy and economical to remanufacture. They were flat plate, one 3/16" and one 1/4". nice long handle making them easy to use. Suitable for all pre-war Austin models as well as Sevens, and probably also a wide range of other older British cars, so would be worthwhile for a supplier to produce in quantity.