We hear it all the time — “find me another one” — and this is exactly one of those watches.

This Omega Seamaster reference 166.0251, often nicknamed the “Baby Ploprof”, is an exceptionally rare piece, made even more desirable by being fitted to its original bracelet — something very few examples have managed to retain.

Produced specifically with the Japanese market in mind, particularly in this silver dial configuration, this is a standout vintage Omega with both rarity and character.

Key Details

• Model: Omega Seamaster “Baby Ploprof”
• Reference: 166.0251
• Case Size: 39mm
• Case Material: Stainless steel
• Case Shape: Barrel
• Dial: Silver
• Hour Markers: Luminous markers
• Hands: Ploprof‑style hands
• Bezel: Black bakelite rotating bezel
• Crystal: Mineral
• Movement: Omega Calibre 1010 automatic
• Bracelet: Original Omega stainless steel bracelet
• Wrist Size: Fits approx. 7.5cm comfortably (7.75cm at a push)
• Water Resistance: Not guaranteed due to age
• Guarantee: 12‑month mechanical guarantee

Condition Report

Case: Honest vintage condition with scratches and marks consistent with age; left unpolished to preserve originality.
Bezel: Original bakelite bezel with age‑appropriate wear.
Dial: Clean silver dial with strong vintage presence.
Crystal: Minor scratch visible up close; nothing significant.
Bracelet: Original bracelet showing wear consistent with age but very rare to find intact.
Additional Note: Small internal blemish near 2 o’clock by the bezel — left untouched as it does not affect performance.
Overall: An original and characterful example with genuine vintage wear.

Working Order

Automatic Calibre 1010 running in fine working order.
Timekeeping at approximately ±8 seconds per day.
Fully tested and supplied with a 12‑month guarantee.

Our View

The “Baby Ploprof” is one of Omega’s most interesting and under‑the‑radar vintage divers. Sharing design DNA with the iconic Ploprof — particularly the hands — it offers a more wearable 39mm case while retaining the bold aesthetic.

What truly sets this example apart is the combination of Japanese market origin, silver dial, and original bracelet — a trio that is becoming increasingly difficult to find.

This is not a perfect, polished piece — and that’s exactly the point. It’s an honest, original watch with real presence and rarity. A fantastic opportunity for collectors and, in our view, one to hold for the future.