Dating the New Departure Model D

[Bozman]

Having overhauled over 20 ND model D hubs this winter (I bought out a couple of bike collections this summer) I noticed 3 types of ND lock rings on the hubs. Which of these models are the oldest (1930s) and the newest 1950s-1960s?

#1 has the word New Departure stamped on it, #2 has no stamping and #3 has 3 notches and New Departure stamped on it.

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[gkeep]

No one else chimed in?

I have a 1952 Schwinn World with ND model D and it has ring #1. I believe this is the original hub, and everything on this bike appears to be original 1952 parts. Maybe this will bring some other responses.

Gary

 

[49autocycledeluxe]

my 1949 has the #1 type. pretty sure it is original to the bike.

 

[rustjunkie]

There are other types as well, different finishes, no text with 1 and 2 wrench notches, and one with a smaller hole for the DD.

From what I've seen chronology is:
2
1
1 & 3
1
It seems that 1 and 3 were produced concurrently, 3 having a short window just after WWII, and it's interesting that it has no groove for the stop light switch.
What I've seen, corrections welcome