First let me say I'm not a hi power expert. but I have a couple and have done some research.
Your pistol definitely predates 1962 because it has the internal extractor.
To my eye the serial number looks like it has been changed at some point. (the first character obliterated, and the E added.) It looks like I can see some proof marks on the slide, right above the slide release lever. There should be a matching set on the frame.
During and right after WWII FN had a whole bunch of contracts to produce the P35. I'd guess that your pistol was made in one of those (again pre 1962). Then it made it's way to Israel where they added the "e". But that's really a guess.
Close ups of the proof marks, any other small marks on the gun and good overall pictures might allow us to pick up on some other subtle variation.
ETA, I had to dig through my other computer for a bookmark, but this might help:
http://damascus-barrels.com/Belgian_All_Proofmarks.html
It's a list of all the Belgian proofmarks. That string of marks on your slide
should be a nitro proof and an inspector's mark (*with a letter under it) That will tell you who did the proof, and generally get you a rough date range. (still pre 1962) They should have stamped a date code in it as well. On my early Hi-power the date code was stamped on the butt behind the magwell, and on the bottom of the slide towards the back. With some wear, and the ceracoat yours could be hard to find. But if you find it, there's a chart in that link.
Also looking at your pics, that looks like it's been rebarreled. Does the Barrel have the Belgian proofmarks on it? (same series as the slide and frame as well as a little bomb/pineapple looking thing) If not, I'm betting that at some point that pistol was refurbished, an new barrel put in , and the SN changed. If I squint just right it looks like it was originally 98830, and became E8830.