Been experimenting this week with different methods to remove the spray paint and keep the layer(s) underneath. The one that ended up working the best was Goof Off, rags, fingernails and rubbing.
There is some awesome info over on the CABE on these Harleys and other Davis made bikes. For instance, there are supposedly some knockoff chainrings out there are are cut rather than stamped out. One of the telltale signs of a true HD ring is the chamfered/beveled edge on the inside if the ring below the teeth.
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I started on the BB to try and find some color. The bottom layer does have a drab greenish look that could possibly be HD green, but I can't find this color elsewhere on the frame. But with the bike being 96 years old it could have had a repaint (or two). Who knows.
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Here is what it looked like yesterday after I finished with the top tube and down tube. Mostly a black hardcoat and a lot of bare metal too. Some indications of a blueish-green color like tarnished copper too.
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After this I removed the ring and took a wire wheel to the face of it.
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What a great project! I found a Harley Bicycle restoration article at this link:
http://www.nostalgic.net/restoration-of-a-1918-harley-davidson-bicycle-part-1
God luck with the restoration.