Patent Plate Minutiae

[Mike Costigan]

At least some of these differences could be down to individual suppliers. I would guess that the Austin Motor Company did not have in-house acid-etching facilities, so these were almost certainly sourced from outside the factory. Typically a basic specification would have been drawn up, but details (such as type-face or number of 'dittos') may be at the discretion of the manufacturer; if the AMC used more than one supplier, it's possible they would end up with the same product but with these detail differences.