Thank you Bob and Stonemind for your opinions on this item.
Howewer, if a "Frankenstein Cap" means a put togheter, I don't share at all this appreciation because it doesn't resist to a direct examination.
There is indeed no such evidence that the cap could have been made from different separate parts.
I think also Bob's opinion about the position of the crown piping interesting but also in this case It may not determine the fact that it's not an original Erel made.
Please see the position of another crown piping, from an earlier Erel made NCO visor, from the enclosed pictures.
It's true that the above shown cap has no stiffener in it's piping, but this is not uncommun neither.

erel1.JPG (95.32 KB, 310 downloads)