Seiko SRPJ41 “Time Sonar” Kosuke Kawamura LE

Overview:

A bold reinterpretation of Seiko’s experimental past, the SRPJ41 “Time Sonar” combines vintage-inspired elements with a modern transparent dial—revealing the movement of its calendar components in real time.

History:

Released in 2022 in collaboration with Kosuke Kawamura, the SRPJ41 draws direct inspiration from Seiko’s original Seiko Time Sonar models of the 1970s.

Rather than being a straight reissue, this piece is a curated fusion of multiple vintage references:

• Checkered bezel inspired by a 1969 Seiko reference
• Handset and dial elements from the 1976 Time Sonar
• Dial ring cues from late 1960s Seiko designs

This layered approach reflects Kawamura’s collage-style design philosophy, blending different eras into a single cohesive piece.

Specifications and Condition:

Overall: New
Case: Excellent
Crystal: Clean
Dial: Clean
Movement: Running well within specifications
Bracelet/Strap: Original
Includes: Fullset Box Paper

Movement:

4R Series

Dimensions:

42mm diameter
22mm lug width
13mm thickness

Design Details:

• Semi-transparent “Time Sonar” dial revealing the date wheel in motion
• Collage-inspired design pulling from multiple vintage Seiko references
• Checkered bezel adding strong retro character
• Layered dial construction with depth and visual complexity

Closing Note:

The SRPJ41 is less about everyday versatility and more about storytelling bridging Seiko’s experimental past with modern design language. For collectors who appreciate vintage Seiko history and unconventional aesthetics, this collaboration offers a unique and thoughtful reinterpretation of a largely forgotten design concept.