86 or 87 Schwinn High Sierra?

Cactus459

Dirt Disciple
Picked up this 198? Schwinn High Sierra. It has the black chrome finish, any cautionary tip on how to polish? Including head badge Pic number 3406 (340 day 86 year) and bottom bracket number GY626586. From what I can tell it is an 86 but the stem makes it look like an 87...any ideas or documents on this bike? Thanks in advance for any an all additional information about this bike is welcome!
 

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Picked up this 198? Schwinn High Sierra. It has the black chrome finish, any cautionary tip on how to polish? Including head badge Pic number 3406 (340 day 86 year) and bottom bracket number GY626586. From what I can tell it is an 86 but the stem makes it look like an 87...any ideas or documents on this bike? Thanks in advance for any an all additional information about this bike is welcome!
If a bike is assembled in December, can I safely assume it is a early production for the following year?
 
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