Serial number says it's a 1972 bike. The Batavus / Margneet / Germaan / Fongers / Phoenix Sprint model sort of straddled the gap between "normal" sports bikes (which weren't very sporty) and the more racing-oriented models during the seventies. They were - and still are - quite popular. I still see them regularly.

They seem to respond well to upgrades. I rather like sykerocker 's Magneet Sprint.