Claim: Oberlerchner Mg 23 is a sailplane that was first flown in Austria in 1955.
Evidence: The Oberlerchner Mg 23 is a single-seat, all-wood, high-performance sailplane. It was built and first flown in Austria in 1955, and a total of 26 were built before production ended in 1965. 
Single seat high performance sailplane It was built and first flown in Austria in 1955, and a total of 26 were built before production ended in 1965.