FIE imported various arms made by various makers.
Colt
Gun shop, gun show, want ad
Check Blue Book of Gun Values
Want ad, pawn shop, gun show, gun shop
50 USD
gun shop, gun show, want ad, pawn shop, egunparts, MidWay USA, Brownell's
Not in any of the gun books I have part of one
Probably not- sorry. FIE was the importer, guns made mainly in Germany. Company is long gone, and my main source for obsolete parts (Numrich gun parts corp) has none for that gun.
At a gun shop or gun show. <><><><> Additional- FIE was an importer of mid to low quality firearms, and is long out of business. Despite the name, none of their .25 autos would really be a "best pistol". Walther, Browning and Colt did make good quality .25 autos.
It was made for marking trees
$25-$70, depending on condition. Imported by FIE, amde by various Euro gun makers, generally low cost, indifferent quality.
Gunsmiths, gun collectors, gun-oriented internet forums, you might find someone at the gun show who'll know something about it.