Seiko Bullhead 6138-0040 | Speedtimer | Caliber 6138B | Portuguese Day Wheel | All Original 1

Seiko Bullhead 6138-0040 | Speedtimer | Caliber 6138B | Portuguese Day Wheel | All Original 2

Seiko Bullhead 6138-0040 | Speedtimer | Caliber 6138B | Portuguese Day Wheel | All Original 3

Seiko Bullhead 6138-0040 | Speedtimer | Caliber 6138B | Portuguese Day Wheel | All Original 4

Seiko Bullhead 6138-0040 | Speedtimer | Caliber 6138B | Portuguese Day Wheel | All Original 5

Member's items (3)

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Seiko Bullhead 6138-0040 | Speedtimer | Caliber 6138B | Portuguese Day Wheel | All Original

43–46 mm·Very good·Seiko

€905.00

Brand

Seiko

Size

43–46 mm

Condition

Very good

Material

Steel

Color

Brown

Uploaded

2 months ago

Up for sale is this gorgeous, all-original Seiko Speedtimer “Bullhead” Ref. 6138-0040 in very nice vintage condition, featuring a beautiful warm tropical patina and a rare Portuguese day wheel — an uncommon and highly sought-after detail that makes this piece stand out among Bullheads At the heart of this Bullhead beats Seiko’s iconic caliber 6138B, a 21-jewel automatic chronograph movement, the first fully integrated two-register automatic chronograph with column wheel and vertical clutch — a technological leap in its time. This movement was so ahead of its era that Rolex later adapted a similar architecture for the modern Daytona in the early 2000s. It also features manual winding and quick-set day/date, innovations that helped Seiko lead the automatic chronograph race in the 1970s. --- Specifications: Brand: Seiko Reference: 6138-0040 Nickname: Bullhead Movement: Seiko Caliber 6138B (21 jewels) Frequency: 21,600 a/h Power Reserve: Approx. 42 hours Functions: Hours, minutes, chronograph (30 min + 12 hour counters), day-date Day Language: Portuguese (rare) Dial: Brown gradient with gold recessed sub-dials Crystal: Hardlex (original) Crown & Pushers: Located at 12 o'clock (Bullhead layout) Bezel: Fixed brown tachymeter bezel Case: Stainless steel, 44 mm diameter Bracelet: Original signed Seiko Speedtimer stainless steel bracelet Water Resistance: 70 m (original spec) Condition: Very good vintage condition – full original, working chronograph, beautiful tropical patina on the dial, slight wear consistent with age

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