Pre-owned Seiko Seahorse Automatic Watch. Reference 6601-9990. This watch is in (C) Good condition. Replacement leather strap is in poor condition. The strap near the spring rods are starting to split. Strap should be replaced. This is a wonderful vintage Seiko with a larger size than normal for the time. 

- Ref No. : 6601-9990
- Serial No./Year: 5600304/1965
- Case:
    37mm diameter, 19mm lug width, 11mm thickness, 42mm Lug-to-lug.
    Stainless Steel
- Crystal: Hardlex
- Movement & Accuracy: 
    Caliber: 6601 Automatic
    Complications: None
    Measured Accuracy: +50 sec/day.
    Amplitude: 183°
    Beat Rate: 18000 A/h
- Band: Replacement leather strap - poor shape
- Condition Rank: (C): Good Condition.
- Country of Manufacture: Japan

Condition Rank Guide:
-N: Item is in New Old Stock condition (NOS). Shows little to no signs of wear apart from some minor handling wear.
-A: Item is in Excellent condition. Micro-scratches can be seen on the sides of the case, bezel, and/or bracelet. No pitting/gouges on the case or scratches in the crystal.
-B: Item is in Very Good condition. Minor scratches and scuffs can be seen on the sides of the case, bezel, and/or bracelet. No pitting/gouges on the case or deep scratches on the crystal.
-C: Item is in Good condition. Moderate scratches and scuffs can be seen on the sides of the case, bezel, and/or bracelet. Minor pitting/gouges may be visible on the case. One or less deep scratches may be visible on the crystal. See photos.
-D: Item is in Fair condition. Heavy scratches and scuffs can be seen on sides of the case, bezel, and bracelet. Significant pitting or gouges are visible on the sides of the case and the crystal shows multiple deep scratches
-F: Item is in Poor condition. Item is not functional. For parts or repair only.