First Generation Dura-Ace.  I've seen weights ranging from 150g (catalog) to 209 for a pair of these.  I personally think the 209 value as it came from an actual person who weighed a pair recently. Produced at least up till 1976.  In 1977 the original Dura-Ace group was re-released as the 7100 series group with the first Dura-Ace rear derilleur which replaced the Crane rear derailleur introduced in 73.

73 / 74 these levers were labled as model M-140, in 75 they were labled as model number MA-100.

I am posting three photos of a new pair with hoods, weighed at 209g.  I am also posting in a separete listing photos of a new pair of identical levers, but for the marking on the blades, which are not perforated and say simply "Shimano."