The weight of a browning BAR II is 7lb.6 oz.empty,the weight of the magnum caliber rifle,s were 1lb more.The browning BAR II was not produced until 1993,so you have a browning BAR first model.The weight is the same for both model.
10-1000 USD depending on specifics
belgium browning bar II safari edition 30-06
The BAR was introduced in 1967. You can still have one that is Belgium made.
67-74
Blue Book of Gun Values might help
1969
You can download a manual for free at Browning.com
Made in 1975
Sometime in the 80s. You will have to call Browning to narrow it down further.
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.
The M69 in the serial number dates your browning BAR to the year 1969.