I'm a little confused. The suicide brake levers usually appear on low end bikes, but the rest of the bike appears rather nice (forged crankset, downtube shifters, 700c wheels, etc.) Perhaps the brake levers are not original.
I'd pay $200 max. I sold a 1988 Peugeot last year with similar components (Shimano 2x6 Light Action) for $175. Sometimes I wish I still had it...