Impossible to answer without knowing who made it, finish, condition, box, papers, accessories.
50-300 depending on specifics
Impossible to answer without knowing the model and who made it.
$50-$100, depending on condition, FIE was not a manufacturer, but an importer, usually of lesser value German firearms in the 1950s-60s.
I have one of these also and wondered the value. Made in USA. PO6134 and Firearms IMP.EXP. Miami FL and Panzer stamped on gun.
This weapon was manufactured by the maker of the MAC10. I have an over-under derringer by FMJ Ducktown, TN. It is a 22cal under and a 410/colt 45 over. Some infomantion is under LEINAD which is Daniel spelled backward. Also COBRAY. JD
1982. In 1998 Davis declared bankruptcy, and the design and tooling were sold. The guns were then made under the Cobra brand name.
The only "named" gun that John Wayne used is in the movie Big Jake. It's an "over/under" derringer named Betsy.
what is value of investram 410 over and under shotgun
Juker reproduction muzzleloading rifles and pistols were made in the late '50's and 60's to sell inexpensively in the sporting goods departments of chain stores. They were often sold as kits. They were rather crude in finish and appearance, and were considered more 'toys' than accurate fireams for serious shooters. Your Juker Derringer kit sold for 29.95 at K mart in 1965. Assembled with a nice appearance, it would sell for under 50.00. It would make a nice paperweight or curio for your den.
Not without a detailed description of ALL markings (under the grips too)
Relative
A pH value 6,71 is a bit under neutral.