Seiko RC-4000 S521-4000 Datagraph Vintage LCD Digital Watch
Super rare model made in Japan
Using Seiko serial number checker tells me it was made in 1985
Beautiful condition looks like it has been looked after and not had much use
Black and gold version
Display is crisp and clear
New battery fitted (BR2325) had to be sourced from Amazon
Incredibly clean 
All functions appear to be working
Keeping good time, alarm tested and working, quite loud for a digital
Will come with a manual (PDF or i can print out a paper copy)
Strap is the original matching one and in good condition, adjustable and will fit a 7 inch wrist
Super rare in this condition.
Open to sensible offers