I know pretty much nothing about these watches. This one seemed a bit different so I snagged it.
These were the seller's pics:
It came in today so I took a few shots of it. It came with an interesting 19mm strap marked:
It appears to be a 1984 build date as the first year on the battery change markings in 1987 and then it goes into the 1990s from there.
I took pics of it beside my 6309-729B to get a sense of size. This one would be a mid sizer from the sandards of the day. In my view it is pretty small compared to what I am used to. The applied indices are really nice though and the blue "Professional" on the dial is really beautiful!
It has a Kanji day wheel which makes me suspect a JDM model. The "Professional" and 200m rating is very interesting as all the other 6458s I have seen are 150m rated. I wonder what Seiko did to garner the extra 50m in water resistance?
This is the most capable watch of its day except for the 600m Quartz Tuna which was supplanted by the 7C46 variant in 1985 which upped the rating of the Tuna to 1000m.
Of course we didn't see 200m ratings in Seiko's "standard" divers until the 7002-7039 in 1995 and 1996.
Any experts on the 6458 want to teach me about this interesting watch?
"Making the world a better place one Sawtooth at a time!" (Zoodles 2006)