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Inspired by the Seiko archives, this timepiece features elements from the popular Time Sonar watch, in an SKX shape.
The eye-catching original 1970s design was famous for its unique translucent dial showing the day/date disc rotation and its highlight red-orange colour Second hand which are echoed in this modern redux.
The watch shape echoes the SKX series of Seiko 5 Sports watches 1990s versions which updated the 1960s originals.
Seiko 5 Sports is known for over fifty years of reliability, durability, performance and value. 5 represents the original five key features of every Seiko 5 still present today: Automatic movement, Day-date display, Water Resistance, Recessed crown and Durable case and bracelet.
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Every Watch, A Certified Original
Energy
Automatic with manual winding
Caliber
4R36
Functions
Date display
Water Resistance
10 bar
Color and Finishes
Blue
Case Shape
Round
Case Size
Diameter: 42.5 mm, Length: 46 mm
Case Thickness
13.4 mm
Material and Finishes
Stainless steel
Watch Glass
Hardlex
Material
Stainless Steel
Strap Color
Metal
Clasp
Three-fold clasp with push button release
Other Specifications
LumiBrite on hands and indices
Gender
Male

Inspired by the original 1970s Time Sonar, this Seiko 5 Sports timepiece revives a design icon with a modern edge. Its translucent dial reveals the rotating day date discs beneath, while the vivid red-orange seconds hand adds a dynamic pop of colour a faithful nod to the original’s daring spirit.

For over fifty years, Seiko 5 Sports has embodied the brand’s core principles of reliability, durability, performance, and value. True to its heritage, this model continues to uphold the five key features that define every Seiko 5: automatic movement, day date display, water resistance, recessed crown, and a robust case and bracelet.
Inspired by the 1970s Time Sonar and classic SKX silhouettes, this watch features a semi-transparent dial that reveals the day and date discs beneath, blending vintage inspiration with modern intrigue.
Powered by a precise automatic calibre with a 41-hour power reserve and manual-winding capability, it ensures dependable performance with a touch of mechanical artistry.
The 42.5mm stainless steel case and 100m water resistance make it durable and versatile, offering a strong wrist presence suited for everyday adventures.
The translucent dial and exhibition case back showcase the intricate inner workings, adding depth and character to its contemporary design.
Carrying the legacy of Seiko’s five key features—automatic movement, day-date display, water resistance, recessed crown, and robust build—it embodies the brand’s spirit of accessible performance and timeless style.
At Circa, we believe in curating timepieces that embody both style and substance.
Seiko 5 Sports SKX Skeleton Style - SRPJ45K1 stands as a testament to this philosophy, offering a blend of aesthetic appeal, durability, and precision.
If you have any more questions or need further assistance, feel free to book an appointment to talk to one of our watch experts at Circa.
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