I photographed these Christen Eagle II examples at air shows in Washington and the EAA Museum at Oshkosh. The two I have shot in the Northwest (N428WA and N14KW) have slight differences in the markings but could almost be mistaken as the same plane.
Four examples I have seen have been identified as #0001… um, ok.
1977 Christen Eagle II #0001
EAA Museum, Oshkosh 2024
1988 Christen Eagle II #0001
Olympic Flight Museum 2018
Olympic Flight Museum 2019
Olympic Flight Museum 2023
1989 Christen Eagle II #BIERMAN-0001
Arlington airport 2022
1978 Christen Eagle IF #0001
EAA Museum, Oshkosh 2024
Cumberland Christen Eagle II #004
Oshkosh 2024