This is a vintage 1970's-90's era white motorcycle helmet. No.... No... No.... not this type of helmet. But the famous Seiko Helmet white dial.
Here like the one below! Nick named Seiko Helmet because of its case shape and design. If you compare the stainless steel case of Seiko 6139-7101 with the shape of the motorcycle helmet, there are some resemblances. The case is measuring at 40mm without the crown. Actually the stainless steel crown seem to be concealed inside the case. Only the two pushers protruding out from the case. 6139-7101 has superbly done satin-polish upper ring surrounding the crystal while the rest of the case is in matte-finish.
After the mineral glass this watch has an inner white chapter ring with the tachymeter indices. The snow white dial has a subdial at above 6 o'clock position. I have seen Seiko 6139-7100 and 6139-7101 with yellow, and red chronograph hand and sub-registering hand. My one all the hands are in black colour and I think it looks fantastic this way.
This watch has a quickset day-date function using the crown to set.
The unorthodox case design is beautiful from some angles. It is well constructed and with a solid feel.
When I got this watch, it is still with the original stainless steel bracelet from the factory.
The fold over clasp has the raised Seiko wording.
From the serial number, the watch was made in February 1979. The production year for 6139 series was from 1969-1979. Hence, this may be the last few batches of Seiko Chronograph 6139 series. Some addressed 6139 to be the World's first automatic chronograph movement. This watch is using the 6139B movement. It is a 17 jewels automatic single register chronograph movement, It has no second hand.
Here is my collection on Seiko Chronograph that I had posted:
More latest model
More to come in near future........