As a follow-up to the note about the Cinelli handlebars, I would like to propose what I have observed as being the different variations that have occurred in the 1A Cinelli stems:
12 mm bar-clamp bolt, grooved clamp surface, no patent number marking on the bottom of stem extension (perhaps only sticker), 7 mm allen key expander bolt with tongued wedge (the tongued wedge is the defining feature)
12 mm bar-clamp bolt, grooved clamp surface, no patent number marking (perhaps only sticker), 7 mm allen key expander bolt without tongued wedge. This should be about 1969.
12 mm bar-clamp bolt, grooved clamp surface, patent number 981528 marking on bottom, 7 mm allen key expander bolt. This should be until about 1972.
There may also be a version with allen key bar-clamp bolt, patent number marking on bottom and 7 mm allen key expander bolt, but I have not yet seen one.
5 mm Allen key bar-clamp bolt, old logo, grooved clamp surface, patent number marking, 6 mm allen key expander bolt.
5 mm Allen key bar-clamp bolt, old logo, ungrooved clamp surface, patent number marking, 6 mm allen key expander bolt.
Allen key bar-clamp bolt, new logo, patent number marking, 6 mm allen key expander bolt. This is from 1978.
Anybody else have any modifications to add or to comment on the chronology?
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Steven Maasland
Moorestown, NJ