Chinese & Seiko Vintage Watch

Chinese & Seiko Vintage Watch
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Rare Shanghai 581's "#7" s/n movement

This is a rare prototype #7- 581's movement.
Please find the comparison of regular 581's and my #7 581's movement as follows:

1.The normal 4 digits serial number under the balance wheel are found replaced by a #7 instead.
2.#91 is stamped on the other side of the main-board.
3.The old type barrel click & regulator index are found.
4.The copper-tone minutes wheels and mainspring barrel are found
5.Stainless steel hour wheel is using instead
6.More drill holes and the mainspring barrel cut are found on the main board
Please note!
Except the number markings on this movement (above pt.1&2), These are also the comment features for those No-serial-number 581's movement, but may not all appear on the same movement.