FIE was an importer and hasn't been for quite a few years. No way to find out when your firearm was made unless you know who made it (most likely German or Italian) and you can find them.
It depends on which company made it.
A 22 LR caliber pistol made by Walther, it is similar in design to the Walther P99.
Nope- not possible. The P22 is a blowback operated action, and is suitable only for a low powered rimfire cartridge. A .45 requires some form of a locked breech, which the P22 does not have.
No
no
The date code for a Walther P22 can typically be found on the slide or frame of the firearm. It consists of a letter followed by a number, indicating the year of manufacture. For example, a letter "A" followed by "01" would indicate the gun was made in 2001. To accurately determine the specific year of your P22, refer to the manufacturer's date code chart or consult Walther's customer service.
$250-$350
Cost, caliber and maker.
WC9 is cast P22.
No
No
P22 Daddy O!!