New Departure Model D Dating

[Miq]

That is the only arm I’ve ever seen on a black hub.
to clarify: i dont know the exact years that blackout hubs were produced, but given that afaik there’s none known with the 1930s or 1950s brake arm we can narrow it to 1940 start and theoretically 1949 end, although i suspect they were stopped soon after wwii at the latest.

Yea I think you're right, they probably didn't continue after WWII, so maybe late 45-46 they stopped. Do people see blackout parts used on prewar bikes 40-41?

@mickeyc has a couple of New Worlds from what I think is the war era and they have the black big arm = brake parts. Lightweight Experts

Just trying to figure out how to date war era bikes. Serial number info is a mess so 42-45 is tough right???