Stoned,
Can't be certain, but almost every early barrel-stamped Century import (Chicom) has pointed me towards it being Israeli-Captured. The two that i have seen now that don't have any specific traits that point it towards the middle east have been:
-LC's 'V' Letter Series
&
-Your letter Series here.
Makes me wonder.. Both letter series.. Same import batch, no specific middle east traits.
But, there have been plenty of 9 & 12 mills that don't scream "Israel cap!" but are. They are easily looked passed and disregarded as what they truly are. I do believe both of your letter series to be Israeli Captures but we cannot be 100% certain.
What will really help their case is if we come across a Letter Series that does have the common features: Arabic marked stocks, red reshellac, black painted part(s), a jiim stamp, etc.
What both of yours has going for it is the Century Mark, and the battle-like patina. Both of which are usually found. Also, let's not forget that China was supplying the PLO very early in the 60's, which fits the Letter Series time-frame spot on.
Something you need to note is there is an oddity. We see plenty of weird markings coming out of the middle east, and the serial restamp is a little odd.
Definitely keep the gun, and an eye out for other rifles and their features. But always look for that Century barrel mark first.