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It would help to see the rear frame forks and the stay bridges in better photos.
Excelsior sprocket..
Teens Miami sprocket...
While similar, they are very different from subject bikes' sprocket/crank setup. Cut-outs in center section and bomber looking crank arm to sprocket interface seems to ensure the crank arms are used specifically with the sprocket. LOOK at the way the ring is radiused/bulged outboard to meet the shape of the crank arms which have a similar bulge design to match.
At the end of the day, someone may/could provide an answer for this style crankset from an ad? I would love to know.
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