100-200 USD
50-150
Depending on EXACTLY what you have, it could range from 200-4000 USD
Put hammer on half-cock and & push rear of barrel to the right.
No
I'm afraid that is like asking, "Does a car have a tape player?" It depends on the make and model. Personally, I have a Colt .22 Model 3 derringer and it does NOT have a safety. But, I cannot speak to the many other makes and models.
You need to leave this to a good gunsmith.
no, just 45 long colt, what is was made for
A .45 caliber derringer typically shoots .45 ACP (Automatic Colt Pistol) or .45 Colt cartridges, depending on the specific model. The .45 ACP is a rimless cartridge commonly used in semi-automatic handguns, while the .45 Colt is a rimmed cartridge originally designed for revolvers. It's important to check the specific derringer model, as some may be chambered for only one type. Always refer to the manufacturer's specifications for accurate information.
made about 1970
Based on proofhouse.com, second model derringers in .41 cal with serial numbers 1-9000 were made between 1870 & 1890.
50-200 USD
about 1970