James McDivitt, NASA S/N 60 wore a ref 105.012-CB (verified- National Air and Space museum). https://airandspace.si.edu/collection-objects/chronograph-mcdivitt-apollo-9 David Scott- no information – S/N64. Unfortunately I could find no information on this piece anywhere. Russell Schweickart: S/N 55: It looks like a either a 105.012-66 or 145.012-67. Looking at the pushers they look like the 105.012-66