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Seiko Prospex SPB455 20MAS ...

In the years since it released its first diver's watch in 1965, Seiko has developed new technologies, features, and designs that have won the favour of professional and recreational divers the world over. Through more than a half-century of innovation, the company has continuously pushed back the boundaries of where sports watches, and diver's watches in particular, can go and how they can be used. Continuous enhancements in safety, reliability, legibility, and ease of use have made Seiko a leader in diver's watches.

Seiko is introducing three new Prospex creations that are modern re-interpretations of the original Seiko diver's watch from 1965, each upgraded with 300 metres of water resistance and a power reserve of three days.

More power, greater water resistance, and enhanced legibility
Each watch is powered by one of Seiko's latest in-house automatic movements, Calibre 6R55, which has a power reserve of 72 hours. The watches are further enhanced to ensure water resistance to 300 metres, a first for Prospex non-saturation diver's watches. The date window has been moved to the space between four and five o'clock to allow for a more symmetrical design and more space to be filled with Lumibrite, ensuring high legibility even in dark conditions.

A compact construction designed for comfort
The reliability, safety, and ease of use required of a Seiko diver's watch are all provided for in the new, more compact design. With a case diameter of 40.0mm, a lug-to-lug length of 46.4mm, and a thickness of 13.0mm, the watch's compact dimensions offer excellent wearability for everyday use. A new bracelet with shorter links and a smaller clasp allows the watch to conform to the wearer's wrist and provides a new level of comfort. The shorter lugs also ensure a high degree of wearability.

Caliber: 6R55

Movement Type: Automatic with manual winding

Precision: +25 to -15 seconds per day

Power Reserve:
Approx. 72 hours

Jewels: 24

Case Material: Stainless steel

Additional Strap: Yes

Case Thickness:13.0mm

Case Diameter: 40.0mm


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 with extender

Water Resistance: 300m

Functions: Stop second-hand function, Date display


We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.

When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.

Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.


Returning Merchandise to


DOMESTIC (orders shipped to the 50 United States , Puerto Rico , and APO/FPO addresses) will accept the return of merchandise within 7 days of receipt of merchandise. Upon receipt and acceptance of your return, will refund your purchase price, minus shipping*, handling, or other charges. Merchandise must be in "new and unused condition" (defined below) to be acceptable for refund or exchange. Special orders are not returnable. Refunds will be in the original form of payment.


*If you receive damaged or incorrect merchandise, contact a Customer Service Specialist no later than 2 business days after receipt at 480-214-0272 or 1-800-486-3996. If there is extensive damage to the box, refuse delivery and contact a Customer Service Specialist immediately at 480-214-0272 or 1-800-486-3996.


INTERNATIONAL (orders shipped outside the U.S. )


If you received the wrong product or a defective item , you can return the item within 7 days of receipt of merchandise for a full refund of your purchase price, minus shipping*, handling, gift packaging, or other charges. Upon receipt and acceptance of your return, your refund will be issued.




The returned merchandise must be accompanied by proof of purchase and all original documentation and packaging; otherwise, the return will not be honored.


You must obtain a Return for Inspection (RFI) number from Arizona Fine Time before returning merchandise. We will not accept any returned merchandise without an RFI number. Contact a Customer Service Specialist by calling 480-214-0272 or 1-800-486-3996 to obtain an RFI number.


All merchandise is visually inspected upon receipt for signs of wear prior to the issuance of any refunds, exchanges or credits. "New and unused condition" means that there are no scratches, marks, or blemishes; the security tags are still attached; and the item must not have been sized or altered in any way. We cannot accept a return of any item with any indication that it has been used.


Return Instructions:


- Repack the merchandise in its original packaging materials, including all paperwork.
- The RFI number must be written on the original invoice and on the pre-printed return shipping label. is not responsible for merchandise that it does not actually receive or is not returned in accordance with these terms. Please contact our Customer Service Department at 480.214.0272 or 1.800.486.3996 if you have any questions or concerns.