Well, I came up with a couple '70s-vintage dynamo light sets at eBay over the weekend, but I'm afraid the experience is turning me into an eBay junkie -- just noticed a gorgeous Brooks B66 saddle...

Here's another dynamo-related question that came up while I was fooling around with the dynamo I rebuilt: Is the wattage in the headlamp bulb supposed to be different if you're also running a taillight? I cobbled up a taillight with another 6V 3W bulb in it and it had a really poor effect on the headlamp. Is it the case that the total wattage of the bulbs has to equal 6?