The Seiko 6139B Incomplete Movement is a mechanical (automatic) movement designed by Seiko, a renowned brand known for its quality Japanese-made timepieces. This movement is compatible with the Seiko 6139B model and is sourced from Japan, ensuring a high level of craftsmanship and reliability. While this particular movement is incomplete and not working, it is ideal for those looking to repair or customize their Seiko watches, offering a genuine opportunity to ensure a perfect fit and optimal performance.