Thank you for your reply, this UZI is a Semi-Auto but I do know that it was assembled in Israel and imported by Springfield (Most were imported by action arms). I really appreciate your detailed response, and yes I posted in the Uzi forum site also. I am starting to think while it is rare it might end up being more trouble then it is worth. (I do not own the gun I was considering trading for it) and I live in AZ.
This is just my opinion after collecting milsurps for several years but not the smg variants. I do spend time on auction sites and read quite a bit on these in collector mags and websites though.
Not sure if you are wanting a collectible or a shooter, but for a shooter, you can find AR pistols, AK pistols, and 9mm variants of the AR pistols that use Glock magazines for example. IWI (privatized IMI) has imported Uzi pistols as well
https://iwi.us/product-category/firearms/uzi-pro/
JG Sales in Prescott (also online) has some foreign military surplus sub machine guns converted to semi auto pistol form as well. Aim Surplus has some and I think Atlantic Firearms does too. Ohio Guns might also but their prices are dealer restricted. Sarco (a military surplus dealer) among others, did have Uzi pistol kits that have to be assembled but believe that you would have to find a lower receiver for it which the Uzitalk people could help locate if you wanted.
Here is that dealer that might give you some idea of what pre-ban IMI Uzi pistols are going for if you didn't find it already.
https://www.kellyenterprises.net/firearms/imi-preban-uzi-pistols-and-carbines.html
As far as collectibles go, all of these sub machine gun pistols are altered from their original select fire capability and are minus the stock. If you really want an asset that increases, you might want to consider an NFA item which has hassles, special permissions from the government, expensive price, etc. but due to the registry for these being closed to new items since 1986, the prices have been skyrocketing. The NFA forum on THR is where you would find information about this. The second would be entering the kit world where people and small mfg make semi-autos out of full auto kits. There are some interesting kits out there but building one and staying legal within the NFA is a specialty in the firearm world. Shotgun News used to run regular publications on taking these kits and making them into a legal semi-auto firearm (try their gunsmithing project compilation book if interested). These won't appreciate as much as the full auto types under the NFA. Sten guns and Uzi's, seem to be the cheapest entry in this world.
The pistol builds came about because most of the select fire smgs had short barrels--thus making them Short Barrel Rifles under the NFA which requires permit, fee, etc. even if converted to semi-auto. By eliminating the stock and making it impossible to mount one, the short original barrels became long pistol barrels and the rest of the conversion made it into a semi-auto pistol (this might also make it easier under U.S. import laws as I think that importation of rifle barrels and receivers from milsurps is now tightly restricted). These are mainly novelty stuff and there are a few mfgs that deal with area of the market with knockoff Mac 10's, Uzi Pistols (IWI), Radom (PPS 43 pistols), etc.
Most of what I know about this stuff comes from reading the Shotgun News for years where many of the sellers of these parts kits place ads and Shotgun News used to have a series on home gunsmithing these into workable semi-auto firearms (to help support their advertisers I think). The ins and outs of staying legally compliant on assembling this stuff gets really complex and I would recommend due diligence before proceeding as the ATF has changed its interpretations regarding specific models from time to time. It is a reason that I avoid this area of milsurp collecting altogether. Have no desire to submit to legal jeopardy by assembling parts kits incorrectly and am unwilling to pay the freight right now for manufactured conversions that avoid such issues.
One potential collecting niche on the cheap is to collect .22 LR replica versions of these smg's that can never be converted to machine guns. The prices on these are reasonable and I suspect that these things might increase in price if and when they are no longer manufactured. CDNN Sporting Goods has some of these like MP5 and the STG 44 clones, Chiappa is a player with M1 Carbines, Mitchell Arms makes a .22 variant of a Soviet WWII smg etc. Airsoft smg collectibles also exist but I have no experience nor knowledge in this area.