I had them out for a comparison and thought you all would enjoy. An incomplete, but getting closer, Telescope, Sighting, No. 32 Mark I collection (missing 4). From bottom to top:
undated UIC
1941 Watson 1st serial number block
1943 Watson 1st serial number block
1941 Kodak
undated HBM 1st serial number block
1943 Kershaw
undated HBM 2nd serial number block
1943 REL
1944 Watson 2nd serial number block