SEIKO Prospex Sea Green Dial | SPB501
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A special dial infused with love for the beautiful ocean
An emerald-green gradation dial inspired by the shimmering light and rippling surface as seen from underwater.
A fabric strap made from upcycled fishing nets
The fabric strap, made from nylon upcycled from discarded fishing nets, is intricately woven using the traditional Japanese technique called Seichu, often used for kimono obi belts.
A new clasp designed for comfort and operability
The new clasp can be adjusted in six steps, each measuring about 2.5mm, for a total range of approximately 15mm. It allows for a comfortable fit at all times, accommodating changes in wrist size during diving and daily life.
Movement
- Caliber Number
- 6R55
- Movement Type
- Automatic with manual winding
- Precision
- +25 to -15 seconds per day
- Power reserve
- Approx. 72 hours(3 days)
- Jewels
- 24
- Functions
-
- Stop second hand function
Case/Band
- Case Material
- Stainless steel
- Case Size
- Thickness:13.0mm
Diameter:40.0mm
Lug-to-lug:46.4mm - Crystal
- Curved sapphire crystal
- Crystal Coating
- Anti-reflective coating on inner surface
- LumiBrite
- LumiBrite on hands, index(es) and bezel
- Clasp
- Three-fold clasp with secure lock & push button release, solid & slide adjuster
- Bracelet Length
- 196.0mm
- Distance between lugs
- 20mm
Other Details
- Water Resistance
- 300m / 1000ft diver's
- Magnetic Resistance
- 4,800 A/m
- Weight
- 174.0g
- Features
-
- SPECIAL EDITION on the case back
- Unidirectional rotating bezel
- Screw-down crown
- Three-fold clasp with secure lock
- Screw case back
- In an actual product, the case back direction might be different from the photograph.
Apparel Sizing Guide for Women and Men.
For WOMEN:
This chart is based on body measurements. Each style will fit in a unique way. Check styling notes in the description of the styles you are interested in for more detail.

Please note:
All measurements should be taken under, not over clothing. Your inseam is the measurement from crotch to floor. If you take measurements in centimeters, be sure to convert them to inches (2.54 centimeters = 1 inch)
For MEN:
Unit: Inch
Men’s Body Measurements
|
Size |
S |
M |
L |
XL |
|
Chest |
34-36 |
38-40 |
42-44 |
46-48 |
|
Waist |
29-31 |
32-34 |
36-38 |
40-42 |
|
Hip |
33-35 |
37-39 |
41-43 |
45-47 |
|
Inseam |
31½ |
32 |
32 ½ |
33 |
|
Neck |
14-14 ½ |
15-15 ½ |
16-16 ½ |
17-17 ½ |
|
Sleeve |
32 ½-33 |
33 ½-34 |
34 ½-35 |
35 ½-36 |