3d. KGV Levant Stamp - Case Of Overinking ?

That dirt under H.M.'s ear looks like the same issue on the left side.

The coloured area does look rectangular, but is not even. The way these stamps were printed rules out that at this angle, the rectangle was caused by double printing. It might be some type of offset, but you would expect that to occur on the gummed side. Maybe a wet stamp of the same colour was lying upside-down on top of this stamp, transferring the image.

The gum does not fit any cancellation removal. It is mint.

@post_pe

If by smudging you mean the 'running' of the colour along the frame: this is quite common on these British stamps of Edward VII.

Rogdcam, I tink it's just a old stamp,there are many reasons tath may have caused it.

Maybe these traces under the ear of KGV portrait were probably caused by not properly keeping it by some of it's previous owners. I don't know. l agree tath the shape of the colored area looks rectangular. I cant say whether the color is applied even but it does look more noticeable at this area. This seemed my very odd. Tath is why l was thinking it for a case of overinking at first.
You also pointed that if it's some sort of offset it most probably had to left some traces on the gum side of the stamp but there are non which can be seen there to indicate this occurrence.
Your explanation is also very logical,I had a similar case few yares ago.The stamp was bicolored ,from KEVII issues.
At first it looked me as an double impression stamp, but when l examined it more carefully a established tath it's a transfer made, from a other stamp apled on it wen it was still wet . The image on it was mirrored and appeared on almost of the stamp ,but much more paler and faint from the main color of the stamp.
I 'm confused, why are there not any traces of it on other parts of the stamp ,but only at the left side of the stamp ?
The double impression variety as you've suggested is not mentioned or recorded for
this issues. The closest l can think of double impression tath is similar is the partial printing on KEGV ,1/2 d ,bottom row .
It's posoble to be a transfer ,but l don't know how did they manage to remove a the stamp lying on it without leaving any traces of their on the front side and achieve to preserve the gum intact as it is at the present moment.

I agree with your remark regarding the image of the KEVII stamp ,l overlooked it when l wrote my post .