The dynohub from the 74 Sprite works fine with the light that I have on the 79 Sports. This is the light that I bought:

B + M Lumotec IQ Cyo Premium T senso plus front headlamp (black)


I think it's a fine looking light and I think it looks fine on the Sports, but it's not "period" correct for either my 79 or your 55 Philips. But, it makes a lot of light -- about as much as any "street legal" modern alternator powered LED light. It also has a low speed short distance light and a stand light. Retro looking LED lights are available from other makers. Also, very small and inconspicuous and, inmo, nice looking lights like the Supernova E3. But that's about three times as expensive as the B&M that I bought. About the same as the hub, spokes, rim, and light.
Of course, it works better with the Shimano generator hub, but with the dynohub, the short distance lights come on with a pretty slow rotation. A slow rotation which I'm guessing may be 3 to 4 mph lights the lamp with a noticeable flicker. A quick rotation lights it up steady. Flicker could be reduced/eliminated by the application of a rectifier, as discussed earlier.

Been working on the 51 Ladies Sports among a number of other things. Concentrating on cleaning and mechanical issues. Had it on the road for a test yesterday. Put a pair of those Panaracer tires that everybody else in the universe likes -- I'll just say, I don't like them. They're not round and they are labeled as 300,000 pa (N/m**2) or about 45psi max (45 psi!). We'll see what happens with 70 to 80.

Got the front brake working and hooked up for the test and it's pretty sloppy. There is a lot of slack, it doesn't center properly, and it moves a lot when applied. Up and down rotational movement centered somewhere along the through bolt axis. Most of the movement is because of the sloppy fit of the parts. I'm not sure if there is supposed to be some fiber bearing washers in there or not, but among the two 50s Sports, there are four brakes, and none of them has any bearing bushings or washers separating the brake arms or taking up the slack in the "stack." I would like to keep the old steel brakes for the looks, but functionality is what is most important for this bike. I am working on it so that it will be ridden and not by me, so I want it to be functional and safe. I'm not too worried about the steel rims when wet, because it will probably never get wet. I may try the steel brakes from the 74 Sprite or the Weinmanns from the 79 Sprite and see how they work. Then, replace those with the Tecktro 559 long reach brakes. Those wouldn't be too bad on either the 79 or 74, but both the 74 Sprite and 51 Sports need an upside down pull rear brake. The Steel "Bull" brakes on the Sprite and the alloy Weinmanns will do that, but I doubt if the Tektro 559s will. What the heck, it's only money.

We don't normally name our bikes, but when working on the front wheel, I noticed something on the bottom of the down tube.



For some reason, we've started calling this bike the Black Widow.