20-80 usd
15-50 USD
10-100 usd
7627
Unknown
$50-$100, depending on condition. FIE was an importer of firearms, mainly from germany- the company has been out of business for some time.
A small pistol / Derringer w/ rotating barrels, imported. Mostly brass colored w/ black barrel 2 shot cap.
You will have to contact RTM to find out.
depending on what parts you kneed a good gunsmith can make the parts you need.
The caliber of a Philadelphia derringer with Jukar 054167 Jukar stamped on the barrel is not known. There isn't enough information to determine what the caliber would be. A gun collector would be a good person to ask.
Worth about 50 or so
50-300 depending on specifics
Impossible to answer without a detailed description of all markings.