The first Astron-labeled watch was Seiko's first quartz model. Here's a photo from the Seiko museum - you can see the shape.
Mine is one of the Anniversary editions - I bought it on a whim at Feldmar's in Los Angeles while on my way to a Feb 29th GTG in Santa Monica. One of 200, it had come out a year earlier and somehow got lost in their inventory OR in 2012 no one wanted to touch a quartz watch with list price $4000. They showed it to me, offered about 30% discount and I bought it on the spot.

Typical Seiko dial with secret details, although normally it just appears glossy black.

It came with all you see here - although I put it on the leather strap pretty early and haven't changed since. Maybe I should check the other straps.
The case is a combination of ceramic and titanium parts
I think I have changed the battery about 4 times in 10 years.
Mike