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D304 reissue the 1st aviation chronograph of China airforce (two black sub-dials)

Part Number W-D304reissueYB
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D304 reissue the 1st aviation chronograph of China airforce (two black sub-dials)
 
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Description

Diameter without crown: 37.5mm

Thickness: 14.5mm

Lug width: 17.5mm

Weight: 60 grams

Movement: ST1901 manual hand-wound chronograph (Upper right button is pressed to start / stop chronograph function. Lower right button is pressed to reset after chronograph function has been stopped.)

Case back: see-through display 

Case material: stainless steel 

Color of dial: antique yellow

Color of two sub-dials: black

Color of hour and minute hands: golden

Color of hour markers: golden

Color of sub-dial hands: white

Color of long chronograph second hand: white

Style: retro classic

The front crystal is either acrylic or sapphire, please choose at pull-down order menu.

 


Brief introduction to D304

In April 1961, commissioned by the first ministry of light industry, Tianjin Watch Factory embarked on a secret project coded D304 to research and develop aviation chronograph for the Chinese air force. Borrowed design ideas from Venus 175, the special task force managed to trial-produce 32 pieces by December 1963. 1964 was the year to make improvement. D304 passed accuracy, high-low temperature, vibration, anti-magnetic, anti-moisture, all tests in October 1965. Jointly approved by 21 administrative units in December 1965, it went into batch production, caliber # ST3. By October 1966, 1400 pieces were produced. Total 3000 pieces were produced by the end of 1968. D304 was made exclusively for the air force, never commercialized for sale to the general public, thus it remained unknown until recently.

Sea-Gull started to rework on ST3 in 2002. The structure of escapement system was modified to be more reliable; modification was also made to the structure, size and cosmetic appearance of some parts, the material of lever and spring, the versatility of various small parts. The improved ST3 is the current ST19 serials.

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