Seiko 5 DX 5139 automatic caliber is a rarely seen watch, produced in the sixties just before the magic lever era.
DX is an acronym for Deluxe, supposedly reflecting upon the general luxury character of the line. They were relatively affordable while still tending to offer design touches found in more expensive watches of the time, such as iridescent or textured dials and applied markers. Styling ranged from conservative to pretty extreme.
Some DX models were also offered as regular Seiko 5 but without the DX markings. But this product line evolved over time by keeping the same stand-out case design, but changing movements and jewel count. (Calibers 6106 & 70xx, 76xx). All of them however featured hacking, in contrast to their standard '5' counterparts and they were not entry level watches due to design and build quality of constituent parts and movement.
It’s a bit quircky this watch.. quickset the date by pushing the crown and opposite to that, the day, by pulling it and turning. Winding this watch you do by a gentle Seiko shake, forsaking the crown. That’s why it is so recessed of course, you are not supposed to ever have to wind it.
This watch still performs it’s tricks after more than fifty years, and looking good too. there are not that many watches that can do the same, let alone have a modern grammar of design. It can stil be your everday watch.