The Mood There is a quiet tenderness in how this heart-shaped frame rests against the skin—not as a tool for counting minutes, but as a small, gilded sentiment. The polished honey-gold case catches the soft glow of the afternoon sun, its smooth curves inviting a touch that feels far more personal than industrial. It is a watch that belongs on a wrist holding a handwritten letter, a delicate reminder that time is often a matter of the heart.

The Heritage Part of the elusive ‘Harmony’ series, this 1f20-5F10 represents Seiko’s specialized venture into high-art feminine timepieces during the late 20th century. The 1F20 movement is a marvel of miniaturization, engineered by Seiko’s workshops to maintain high-precision quartz reliability within a case no larger than a charm. While the watch world often obsesses over rugged steel, this “Super Rare” heart-shaped survivor speaks to a time when Japanese design focused on the absolute poetry of form. Now paired with a slender obsidian-textured leather strap, it provides a striking contrast that makes the warm aurum of the case truly sing.

There is a quiet tenderness in how this heart-shaped frame rests against the skin—not as a tool for counting minutes, but as a small, gilded sentiment. The polished honey-gold case catches the soft glow of the afternoon sun, its smooth curves inviting a touch that feels far more personal than industrial. It is a watch that belongs on a wrist holding a handwritten letter, a delicate reminder that time is often a matter of the heart.

Part of the elusive ‘Harmony’ series, this 1f20-5F10 represents Seiko’s specialized venture into high-art feminine timepieces during the late 20th century. The 1F20 movement is a marvel of miniaturization, engineered by Seiko’s workshops to maintain high-precision quartz reliability within a case no larger than a charm. While the watch world often obsesses over rugged steel, this “Super Rare” heart-shaped survivor speaks to a time when Japanese design focused on the absolute poetry of form. Now paired with a slender obsidian-textured leather strap, it provides a striking contrast that makes the warm aurum of the case truly sing.

Case width: 22 mm
Lug to lug: 26 mm
Lug/Bracelet width: 8 mm
Max wrist size: 20.4 cm
Case material: Gold-plated Base Metal with Stainless Steel Back
Dial: Stark matte white with minimalist baton indices and ‘Harmony’ signature
Crystal: Hardlex
Movement: Japan Quartz Cal. 1F20
Production era: Circa 1990s
Condition: Super Rare