There are 4 Kolb MARK III aircraft on the U.S. registry that TailWiki has a page for. Every one is built from the public FAA record — year, serial, engine, home base, and registration history — and owners and pilots add photos, trips, and stories on top. The ones listed here were built between 1992 and 2001.
N6230X
2001 Kolb MARK III
Merced, CA
N456JP
1997 Kolb MARK III
Bell, FL
N3696S
1992 Kolb MARK III
Roscommon, MI
N80455
Kolb MARK III
Wampum, PA