Seiko did three of these - the grey, a green one, and a rather lovely explorer esque black one (see below) - they were fairly good value at RRP but now go for 2x or even 3x
Yeah seen them thanks. Its a TicTac Anniversary edition. There isn't a green version, I think you're getting mixed up with the Seiko Alpinist. Thought the other image showed the dial better as the one above looks ore of a browner tone when its more grey in real life.
Ha! Been eyeing up the grey dial version, keen to see one in normality.
Also Seiko wise, really wishing I could have got one of these, only just discovered this model, JDM issue obviously!