Hi
@gkeep
Your Westfield number is almost undoubtedly an E = 1927. Unlike the 'upside down D' above, which possibly could have been alcohol induced (-:, your's is a problem of stamping on to a curved surface. I don't have any examples this early to show you, but the next time Westfield ran through these date letters, E's often come out like a T on it's side. They tend to ensure that F is stamped so that the top shows better, so sometimes this looks like three sides of a square, and the tail is missing.
The E tends to have all three horizontal strokes the same length, and the F the centre horizontal stroke is shorter than the upper one.
I think this is why Westfield eventually moved the stamping to the rear dropout, in order to be working on flat steel. Bikes have a lot of curves (-:
Best Regards,
Adrian