Seiko 6138 family is among the most prominent vintage Japanese chronograph. Don't know who the hack starts calling these watches with fancy nicknames. We have the Bullhead, the Panda, and of course the topic of the day, the UFO.
By any standard, this is an enormous stainless steel mass. It is big and bulky and tough like a tanker. Seiko initially labelled it Yachtsman in their advertisement.
I guess people start calling it UFO due to its oval shaped case that somewhat look like ET spacecraft. UFO has a very enchanting tachymeter bezel. The black bezel with red inner circle gives a racing feel.
The black dial and the silver subdials is very distinctive and eye-catching. The hour and minute hand are lumed. The chronograph hand are in racing red colour. 6138 is without the second hand. There are day and date display at 3 o'clock position.
The bracelet I used for this watch is a genuine Seiko stainless steel bracelet, but it is not the original bracelet for this model.
The UFO is powered by 6138 movement that was produced from 1971-1979. 6138 is a double register chronograph with quickset day date. It is a 21 jewels automatic movement with a frequency of 21,600 bph.
Below is the Seiko catalogue that showed some of the 6138 variants inclucing: Bullhead, Sliderule, and UFO. You can click on the word Bullhead and Sliderule, to go and view my collection.
Seiko 6138-0011 chronograph has achieved a cult status. It is among one of the most highly sought after Seiko watches by Seikoholics and followers.