Speaking of TOS props, anyone ever get a good look at the flip-top communicators used by the Klingons, etc.? (link to pic)
The interior is visible for about two or three frames in "Elaan of Troyius." But Greg Jein has the original prop, so we know what the interior looks like. Here's a shot of it on display at Worldcon in L.A. in 2009. Note the cool cut out symbol on the lid:
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(Photo courtesy of Mr. Karl Tate)
Cut out could be just for the lid to clear the two knobs when closing (?)