Identifying this Whisky - Grants Standfast Blended Scotch Whisky

Hey,

I've Just found this whisky at my grandpha home.
He bought this bottle in (maybe) switzerland, 1960-1970..

You may cannot see what is written, so here it is:

W.M GRANT & SONS LT°
GLASGOW SCOTLAND


GLENFIDDICH
STAND - FAST
REGD N° 882366





Im asking for helping me to identify it ( aged? how many years? ) and discuss about this whisky (say what you think about it)

Thank you,
John.