Probably late 80s, early 90s. Looks exceptionally good.
If you look at this bike carefully to see how everything folds up, you'll find it's one of the most compact folders, it gives the Brommie a run for its money. I had one very similar and it was easiest the most compact folder I had.
Hmmm.. Guess i must take another look at mine then. i think it is big, heavy, difficult to fold and unfold. I replaced cranks rims and bars to make it lighter. Mine is a 3 speed hub.