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I don't think I've seen two opposing leaves like this before with a central standing leaf...


..What distance is the standing leaf for? I would guess 100 m. The "079" 200 m. And the 300, 300 m.

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Your guess is correct regarding 100m, 200m, 300m, '079' matches last three digits of S/N as stamped on other parts.

Description of 'Standard Three Leaf Sight' from 1939 Stoeger:

"...the three-leaf type with folding leaves for 200 and 300 meters, and the centre sight for 100 meters permanently fixed;" (interesting they used a British spelling for 'centre' while going Yank for 'meters').

So; both leaves down = 100m, rear leaf up = 200m, front leaf up = 300m.