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Old 02-02-11, 03:34 PM   #1
rhm
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how old is my dynohub? Questions about an early dynohub.

I got another dynohub, a nice 32H front one, which I overhauled successfully and am now idly trying to figure out exactly how old it is.

I know, there's a date code. And I found it, too. It reads:

4 5 6

which I figure I can interpret either as 4/56 or 45/6 or as just some random numbers.

But I also know these hubs changed little by little over time. This one has an oil port, a feature I've never seen on a front dynohub before. The dynamo-side face, where the electrical terminals are, is a dull matte colored stainless steel, just like on a DynoFour hub I have (which is dated 50 2).

So, my question for those of you who have dynohubs dating to the period 1945 - 1956: does mine sound like a '45, or a '56?
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Old 02-02-11, 04:36 PM   #2
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Quote:
Originally Posted by rhm View Post
I got another dynohub, a nice 32H front one, which I overhauled successfully and am now idly trying to figure out exactly how old it is.

I know, there's a date code. And I found it, too. It reads:

4 5 6

which I figure I can interpret either as 4/56 or 45/6 or as just some random numbers.

But I also know these hubs changed little by little over time. This one has an oil port, a feature I've never seen on a front dynohub before. The dynamo-side face, where the electrical terminals are, is a dull matte colored stainless steel, just like on a DynoFour hub I have (which is dated 50 2).

So, my question for those of you who have dynohubs dating to the period 1945 - 1956: does mine sound like a '45, or a '56?
What side is the adjusting cone on? If the dyno side, with a notched adjusting washer, I'd say '45; if on the other side, '56.
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Old 02-03-11, 07:46 PM   #3
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IIRC 1945 was the first year for the GH6.

Here is a picture of one on the SA heritage site, but it doesn't say what year that hub is.

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Old 02-03-11, 07:55 PM   #4
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If the date stamp follows the convention of the other Sturmey hubs it would be YY M(M)
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Old 02-03-11, 07:58 PM   #5
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Rudi, the Dynohub on my '49 Clubman has an oiler clip and a date code of 4 9 5 with spacing kind of like that.

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Old 02-04-11, 08:18 AM   #6
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Thanks, guys!

Neal, does your '49 hub have a bakelite face, or steel? Your 4 9 5 date would suggest mine is 45 6, but there's one on ebay now with a date that reads 10 5 4 which would argue the opposite.

GNA, it seems my adjusting cones is on the non-dynamo side, so I guess that nails it... unless someone changed the axle.

Here's my hub, after cleaning. It's really hard to make an automatic camera focus on shiny chrome.


Last edited by rhm; 02-04-11 at 08:23 AM.
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