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Could be 'Semi Round', official FAA font for aircraft registration numbers.
See here for sample (PDF).
Thank You! Looks prefect!
If you want a digital version you might try one made by bladerunner900 and posted to The A2A Simulations Community on Jan 27, 2014 as "AviationSemi-Roundstraight" http://a2asimulations.com/forum/viewtopic.php?f=98&t=38435
BTW did you notice that the version in your image seems to be sloped 15 or 20 degrees left. Compare the _N_ to the row of rivets. Sloped aviation fonts are discussed on the page I linked to in my previous post.