For what it's worth, my wife and I were watching "Storage Wars - Texas" last night. One of the auctioned storage containers held a little surprise! A sextant, complete with all the lenses and a box. After rerunning the segment several times (thank goodness for DVR) I was able to read the label:
"Hezzanith Observatory" "London" embossed on a round coat of arms. Bellow that was the Certificate of Examination for sextant No. P-202, dated August, 1945. We were not able to see any othe numbers or details...
Brad