Seiko Harmony 1001SM

Seiko Harmony 1001SM – A 1961 Interpretation of Quiet Elegance!
Produced in the early 1960s, when Seiko was catching the winds of modernization in Japan and beginning to combine them with Western-style refinement, the Seiko Harmony is a model that perfectly reflects the brand's ethos of "elegance and mechanical simplicity."
The "D112161" code in its serial number indicates that the watch was manufactured in April 1961, making it a first-generation example of the Harmony series.

With its elegant dial, thin gold-toned hands, and smooth operation, this model is a silent witness to Seiko's transition to design maturity.

Movement
Caliber: Seikosha 205
Type: Mechanical, hand-wound (center second)
Jewelry: 19 jewels ("SEIKOSHA 19 JEWELS" on the bridge)
Frequency: 18,000 bph
Protection: DiaShock shock absorber
Note: The bridge clearly engraves "205"; this is a 1960–61 urban-dress-oriented caliber designed for a slim profile and low friction. Winding feels smooth and runs quietly; regulation is easy with the indexed fine-tuning crown (±).

Case and Glass
Reference: 1001SM
Serial No: D112161 → Manufactured in April 1961
Diameter: 31.1 mm (measurements confirmed in photo)
Material: EGP 20-micron gold-plated, stainless steel back
Glass: Domed acrylic
Dial: Satin silver finish, gold baton indices, and needle-shaped hands
Crown: Embossed S logo
Strap: Black alligator leather with gold buckle

Design Details
The calligraphic inscription "Seiko Harmony" stands elegantly at the center of the dial.
Gold baton indices and thin hands enhance the simple look; the circular brush pattern creates a silky depth in the light.
The slim case profile offers the feel of a true city dress watch, disappearing beneath the cuff.
The domed acrylic glass preserves the soft reflection of the 1960s optical illusion.

Case Interior / Engraving
The following inscriptions appear on the inside caseback:
FRONT EGP 20 MICRONS – BACK STAINLESS STEEL – D112161 – 1001SM – SM
These inscriptions indicate both the 20-micron coating thickness and the production/caseworkshop code (SM) of the period.

Why Valuable?
Historical context: 1961 was the year Seiko shaped its vision of haute horlogerie (Grand Seiko 3180, etc.); the Harmony represents this transformation in minimalist elegance.
Early mechanical Seikosha: Cal. 205 (19j), a reliable hand-wound watch developed specifically for Seiko's slim, urban-dress line.
Rarity: The Harmony family was produced for a short period; fully functional examples from 1961, retaining their original details, are rare in the collectors' market.
Material standard: 20-micron gold plating was Seiko's premium level of plating at the time; It maintains its visual integrity for years.

Specifications (Summary)
Feature Value
Reference 1001SM
Manufactured April 1961 (D112161)
Caliber Seikosha 205, hand-wound, center seconds
Jewelry 19 jewels
Frequency 18,000 bph
Protection DiaShock
Case EGP 20 µm gold-plated, steel back
Diameter 31.1 mm
Glass Dome Acrylic (domed)
Dial Silver-satin, gold baton index
Strap Black leather, gold buckle
Final Word

The Seiko Harmony 1001SM (1961) is a manifestation of Japanese elegance, understated yet full of character.
With its slim gold-toned case, silky dial, and the smooth movement of the Cal. 205, it measures not "time," but harmony.
Its lightness and elegance delight even in everyday wear; on the collector's shelf, it shines as a rare memory that keeps the spirit of Seiko's early 1960s Seikosha alive.

The item you are viewing was manufactured in 1961.

Professionally overhauled and FULLY SERVICED (the movement is completely disassembled, its components are cleaned, oiled, and adjusted), your watch will function flawlessly without any surprises. (Maintenance-free for 3 years unless exposed to direct water or high humidity for extended periods.)
Item Condition: Tested and fully functional.