The seams are quite crude in there sealing. Belstaff customer 'experts' don't help for jackets before 1980.
Any help is appreciated.
The logo looks like that kind of era or earlier to me, but the adverts and jackets I found in a quick search didn't seem to match.
Logos are not always a good clue of age. Some labels/logos are used across decades and sometimes old logos are re-used after a break.