Claim: 16525 Shumarinaiko was discovered by K. Endate and K. Watanabe at the Kitami Observatory on February 14, 1991.
Evidence: It was discovered on 14 February 1991, by Japanese astronomers Kin Endate and Kazuro Watanabe at the Kitami Observatory on the island of Hokkaidō in northern Japan. 
K. Endate
K. Watanabe 14 February 1991