Can’t you solder in a new item port? preferably USB-c?

Well, the ultimate holy Grail would be this individual watch

Second would be a “true Pogue” of the same spec and very close in serial number, although that would have to compete with a few other nice Seikos… There are so many out there. A platinum first Grand Seiko. A Seiko Spacewalk. A working and complete Seiko TV Watch (as seen in James Bond - Octopussy) 😉.

I do own a fine 6139-6002 yellow dial. However, that’s a later “rest of the world” model, with a more golden dial and different wording. Still nice, though. 😊

My hobby is (or rather was) collecting Seiko watches.

I stopped buying watches, but my holy Grail would be “The” Pogue. The original 6139-6005 yellow face automatic chronograph worn by Col. William Pogue on the Skylab mission.

Other than the NASA issued Omegas, this was his personal watch that he just took with him into space, as NASA didn’t want the Astronauts to take their Speedmasters home and so they couldn’t train as much with them.

This also was the first automatic chronograph in space, as no one had tried before if they would work without gravity (surprise, they did, as momentum is still very much a thing in space).

Here is a very nice write up by a very knowledgeable guy:

https://www.plus9time.com/blog/2017/12/24/the-true-seiko-pogue-chronograph-6139-6005

You no longer have to share your phone number in signal. They added a unique user identifier a while ago that you can share to add new contacts. This is not permanent by the way, you can change this user identifier anytime.