You can download a manual for free at Browning.com
67-74
The BAR was introduced in 1967. You can still have one that is Belgium made.
Parts are made there, but, it is assembled outside the country.
Made in 1975
The suffix of M71 was assigned to the Browning model BAR(Browning semi-auto rifle) which was made in the year 1971 in Belgium for Browning.
Sometime in the 80s. You will have to call Browning to narrow it down further.
Your browning model BAR which was made in 1985 should say either made in belguim on the barrel,or made in belguim assembled in portugal on the barrel.
Your browning BAR with a M70 suffix dates your browning BAR to 1970,not 1952.The first browning BAR rifles were made in 1967.A browning BAR rifle is valued at between 400-600 dollars for a grade I rifle with a 60%-90% original finish and a good bore.
If you are asking about a Browning BAR rifle,then it was made in the year 1968.
Information is not in the public domain.
Best left to a trained gunsmith.
100-1000+ depending on specifics