Currently D813.581 installed with mineral front crystal is on sale for only $145US each.
Sea-Gull D813.581 is 44mm in diameter
excluding crown, 13mm thickness, 110 grams weight, ST2553 automatic 25-jewels, green dial, silver case, green canvas wristband. Although it is big in size, it has to be big to appear like a man.
This is a well-built leisure or field watch to show off one's masculinity.
As shown on photos, Sea-Gull logo at 12, "automatic, Chinese military
watch since 1964" at 6, a tank on caseback. Year 1964 was the start
of quantity production of airforce chronograph 1963. 1964 represents the pride
that Sea-Gull produced the 1st army watch for the air force.