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Old 11-20-17, 01:13 PM
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Location: San Marcos, CA
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Bikes: Too many, but sometimes not enough.

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Your Sekai was almost certainly produced by the Japanese firm Miki in 1983. With the Champion #1 tubing, it's probably their 4000 model, or possibly the 5000. The 4000 was more or less the same as the Centurion Semi Pro, with Tange #1 up until ~1979. After that, the Semi Pro went to Tange #2. I'm not sure about the Sekai 4000 around the time of your bike. The late 70's Sekai 5000 used Tange Professional, an even lighter tubeset, but may have switched to #1 by the time of your bike.

If you want to sell it here on BikeForums, you need to buy a subscription to this forum, which will let you post sale ads in the "Classic and Vintage Sales" sub forum. It doesn't cost much, and will get you pretty wide audience of bike nerds :-)

You might want to start a thread in the "Appraisals" forum, with some detailed photos. The value will depend heavily on the condition of the bike, it's components, and your local market. (Big metro areas often drive prices 2x higher than sparser rural markets.)
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