Mystery cog. Who can tell me what I have here?

[piercer_99]

Okay, so I bought a box of New Departure parts and this cog was in it. It isn't for a New Departure C or D hub, to big for the driver.

Anyone have a clue?

Made in Japan, 10t 1" pitch (skip tooth) cog.

35.25mm i.d. or 1-25/64" i.d.
4.4 mm thick or 11/64" thick

 

[piercer_99]

Not even one reply.


Can't edit the title to add help wanted or anything either.

 

[Gordon]

Might be Bendix or Musselman, they are interchangeable.

 

[rustyjones]

The symbol looks like the NK (Nan Kai) symbol. I know they reproduced the model D (under their name) in the 70's, but all the cogs had 1/2" spacing.

 

[ricobike]

My gut feeling is that it is a European standard of some kind. Looks like the early Mark IV's which I believe were german made had a threaded cog (see attachment). It might be for one of those. The skiptooth is weird though. It is a conundrum.

Edit: I found a Komet Super dated 1961 (date code D) with a screw on sprocket. The ID of the sprocket on that hub was smaller than the OD of a New Departure driver so that's not it, at least for the more modern Fichtel and Sachs hubs. Maybe something earlier?

Edit2: It's definitely a Nankai built sprocket. Nankai was most famous for continuing to produce an almost exact copy of the New Departure Model D when New Departure exited the business in 1959. They also later produced a hub of their own design but I don't think that they would have used a screw on sprocket and certainly wouldn't have a skiptooth version by that time.

 

[piercer_99]

well, thank you to those who have tried.

If anyone needs or wants it, pay the shipping and it is yours.

 

[ricobike]

Not to beat a dead horse, but this might be the missing link. I saw it the other day and just remembered it now.

https://rover.ebay.com/rover/1/711-...0001&campid=5335809022&icep_item=172654232935

This must be an early version of the New Departure copies (NK75) since it has a screw on sprocket. And the lock nut does look larger than any New Departure lock nut. Maybe your cog is for an early version of the NK75 hub.