On the initial pics I saw nothing that would indicate that it was not genuine. The biggest give-aways on these are normally the perfs. Scotts calls these perf 12, and Kiusalas called it 12-66 but actually it is 12-66.25 (perf 11.885).
Big recommendation, USE THE RIGHT PERF GAUGE! This is the gauge I use.
http://www.slingshotvenus.com/stamp...tyPerf5.htmlReal big thing here is that the 386 is not common but it is not real rare. This stamp should always be approached with caution to ensure that you are getting the stamp you paid for.
EDIT: The only thing I saw that was really a concern is the top stamp on 386 original post (with guide line) is the 3rd perf hole from the right on the top. The resolution was not good enough to really say it was a problem. I always closely check the perfs on all the rarer coils.