747 100/200 differentiation question

From:         "Bryan H. Lang" <concorde@ecst.csuchico.edu>
Organization: California State University, Chico
Date:         10 Jul 95 03:18:19 
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As a quick visual differentiation between the 747-100 and -200, I had always
thought that the trailing edge of the engine pylon worked well. The -100
had an almost straight trailing edge leading up to the wing, whereas the
-200 trailing edge extended aft, curved up sharply, then straightened out
to the wing.

That worked fine until yesterday at Changi. An Olympic 747 SX-OAB had the
-100 pylon's trailing edge - but the aircraft was clearly labeled a -200.

Were many -200 aircraft made with the straight pylon trailing edge? And
is there another reliable way to visually differentiate the 747 classics?