Date of Miroku 6000 introduction

Hi, does anyone know what years the Miroku 6000/7000 was introduced and ended in the UK?

This video might help.

Thanks for a great video, however no exact dates given

Can’t be exact but it was around the same time the Browning 325 was around , that would be late 70’s . I know I bought my first 38 trap late 90’s so the Miroku thousand designation guns were finished by then . 
 

As you seem to be a bit of a Miroku buff , you might be interested in an advert I’ve just seen in this months ‘The Field’ . In all the stock advertised by Sportarm is a picture of a used Miroku President Grade , doesn’t say which model , but it’s a rare beast whatever it is . 

Thanks for that info, it seems, from what I have discovered, to be as you said, introduced late 70s and finished very early to mid 90s when the MKs 60, 70 and 38 were introduced. Does anyone have any old catalogues?