Phew! - got there! - took a lot of shaking but eventually the second hand moves 30 secs when I press the power reserve button. Poor thing had been forgotten about for over 5 years so I thought the rechargeable battery may not be able to be resuscitated but it's now ticking way like a champ.
I initially tried the old Braun toothbrush charger trick but while that got the second hand doing the two second skip it never got any further, even after 4 days. My theory is that the Braun was giving it enough power to get it moving but not enough to charge the battery as well - so lots of shaking ensued.
Now it's running I want to wear it but the reason why it was put away in its box and forgotten about for so long is it's too tight for my wrist - it's nearly there but too tight for comfort. If anyone has spare links with collars & pins for this watch that they could part with please contact me.
Seiko Kinetic 5M62-0BL0
https://i.imgur.com/DNRjLFj.jpg
https://i.imgur.com/bwxRKn6.jpg
https://i.imgur.com/EIVlvhG.jpg