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I would think there should be a build date stamped in the head badge.
Bicycles from Japan will have serial numbers located on the left, rear axle hanger, on the bottom bracket shell or on the lower section of the headlug. The number will have a production month letter in either the first or second position and a production year number in the other (first or second) position. Examples: J677123 = September, 1976.
Japan numbers again. But I'm still confused. No stamping in the headbadge? Sometimes it's really hard to see, so maybe take a picture of it and blow it up for viewing.
So the S was replaced with an I and the B is for Feb. and the year is 0 or 1980. My best hunch.
Quote from Re-Cycle:
The 1978-1983 Le Tour and Super Le Tour models had their serial numbers on the left rear axle hanger and many began with an 'S', followed by the Japan Made numbering system.
This one is a bit confusing but I think the 1Bxxxxx serial places the frame stamp in Feb. 1981. I know the first character doesn't match the 1 seen later in the number but I think that was a mistake as I don't believe they used two letters to start a serial number and the second character is definitely a letter. Here is another '81 where the second letter character was in fact an "i": https://www.bikeforums.net/classic-...appraisals/1007360-schwinn-serial-number.html
If the badge is original it will have a small 4-digit number stamp indicating the day the bike was built (look closer, it is there). Here is the '81 catalog page:
I bought mine for $250 but it was clean and had a straight handlebars so I use mine for 99% of my rides. The tall frame is too high for Captain and The Boys to not be easily smashed during the occasional emergency stop because I am old and stubby. The bike is not defective but my giggly bits have become less reliable from extensive biking. I use to be able to hold up seven umbrellas no-handed but now I am old and stubby. I hope that this helps.
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