To rule out an original variation is exactly why I would like to get one of those Traders repro's No.2043H .. ! I do believe it is the insignia in question - it has the false left eye characteristics , and the short line on the right temple . As far as the teeth go , this may be due to pixelation , picture used is a cutout blowup .
2046B ( camo ) and 2045D are indeed a different type of repro , and fortunately not as good .

But most importantly - as far as I know , the skull discussed has not ever turned up on any woodwork finds . Like e.g. the many Fezzes that make for excellent reference - and on which all other types can be found .
They do however turn up frequently on repro headgear ..

Screenshot - 23-7-2012 , 0_12_23.jpg (51.11 KB, 41 downloads)