There is no officially published, exact number of how many Seiko Prospex “Ice Diver” SPB177 watches were built. The SPB177 is marketed as a USA special edition tied to Naomi Uemura’s 50th‑anniversary tribute, but Seiko does not state a limited production count for this specific model in its public materials.

Quick Scoop

  • Model : Seiko Prospex Automatic “Ice Diver” SPB177 (often called SPB177J1)
  • Edition : USA Special Edition, released in 2020 as part of the “Ice Diver” trio (SPB175 / SPB177 / SPB179).
  • Production number : Not disclosed by Seiko.
  • Market status : Generally considered a limited special edition, but without a stated global or regional cap like “500 pieces” or “1,000 pieces”.

Why the number isn’t known

1. Seiko’s usual practice

For many special editions, especially in the Prospex line, Seiko:

  • Calls them “limited” or “special edition” in marketing.
  • Does not publish exact production quantities unless they are clearly numbered limited runs (e.g., “worldwide 800 pieces” models like some SBPY/SB series).

The SPB177 falls into the “special edition but not numbered” category, so no official figure exists.

2. What the internet does say

Forum posts, watch blogs, and dealer pages describe the SPB177 as:

  • A USA-only special edition based on the Sumo design.
  • A tribute to Japanese adventurer Naomi Uemura and his Greenland/ice expeditions.

But none of these sources quote an official Seiko statement like “only X units were made.” They simply call it a limited or special edition and discuss availability, design, and price ($900 USD at launch).

How this compares to clearly limited Seiko models

Some Seiko models explicitly state a production cap:

Model example| Stated limit (if any)| Notes
---|---|---
SBPY177 (certain SBPY variants)| 800 pieces worldwide| Clearly marked as limited in Japanese listings 9
Many Prospex “special editions”| Not stated| Often limited regionally, but no exact count 16
SPB177 (Ice Diver)| Not stated| USA special edition, no published number 23

The SPB177 is in the second row: a special edition, but with no official “how many were built” number.

What collectors and forums speculate

In watch forums and secondary market discussions:

  • Some users assume the SPB177 was produced in a relatively small batch for the US market, given club-style scarcity and periodic “hard to find” mentions.
  • Others note that it’s not as tightly controlled as obviously numbered limiteds, so actual production could be in the low thousands , not hundreds.

But these are speculations , not confirmed data. There is no thread, press release, or Seiko document that says “X units of SPB177 were made”.

Bottom line

  • Official answer : Seiko has not disclosed how many SPB177 watches were built.
  • Practical answer : It’s a limited USA special edition, likely made in a small-to-moderate batch, but any exact number (e.g., “5,000” or “1,200”) found online is unverified speculation.

If you need a precise number for insurance, valuation, or storytelling, you must treat it as unknown and avoid stating a specific figure unless you can get a written confirmation from Seiko USA or an authorized Seiko representative. Information gathered from public forums or data available on the internet and portrayed here.