Thanks for taking the time to scan and post these images Geoff. I actually have an "original" print of the same photo in approx 11" x 9" size. On my copy, you can clearly read the serial as HK137, and the code is not visible. My grandfather has recorded HK137 as ME-O. It would seem that this is an incorrectly identified aircraft, which has lead the historians astray!
A crop of my image attached for reference.
