I have a very similar Pulsar Spoon watch, with the same W671 module, mine has a blue mirror crystal and a red LED backlight for the negative LCD display. As far as I know these were made in the early to mid 1990's. They are pretty durable and waterproof. Sold in Japan as "Alba Spoon"
Seiko still services them, I had mine serviced a year ago from them.
Fun watches with a retro look.
Below is a pic of my two spoon watches.
Spoon watch with Silver digits, (LCD display uses a white crystal with mirror backing instead of traditional black color.)