This is the original winding stem for the Seiko Kinetic.

This stem suits among other on the following case numbers:

5M22-6A90, 5M22 7A60, 5M23-6B73, 5M42-0A10, 5M42-0A40, 5M42-0A80, 5M42-0A40, 5M42-0E69, 5M42-0E70, 5M42-0G70, 5M42-0H60, 5M42-0L30, 5M42-0M60, 5M43-0C60, 5M54-0AB0, 5M62-0AL0, 5M62-0AT0, 5M62-0BM0, 5M63-0A40, 5M65-0AD0, 5M65-0AA0, 5M82-0AT0, 5M82-0BE0, 5M82-0AS0 YT57-0A90, 

Seiko models:

SGT280, SKH301, SKH365,