to my knowledge ammo unless mil spec only is iterchangable with any weapon that fires the same caliber
100-1000 USD or so
300-700 USD
It was a .41 caliber cap and ball pocket pistol marked Derringer and is on display at the Ford's Theater National Historic Site in Washington, DC.
200-1000 USD
Colt Model 1877 "Lightning" Double Action Revolver in caliber .38 Colt and the similar revolver model "Thunderer" in caliber .41 Colt.
Call S&W and they will tell you when it left the factory. It could have been made a week to a year before.
made in 1896. If it's in good shape, it could be worth around $4000
Remington did not make a 44 cal double barrel pistol. The did however make a 41 cal (rimfire) the double derringer. (model 95) There's 3 type's, 5 models, and at least 15 variations some of which are quite valuable.
This pistol was made between 1935 to 41. However without more information about the condition of the pistol it is not possible to give you an estimate of value. You need to give it some sort of rating like Poor, Fair, Good, Very good, or Excellent condition.
Shotguns aren't usually measured by caliber, except the 410 and some uncommon ones that use birdshot in a pistol cartridge. No one can tell you from just a serial number (which may be only a manufacturer's assembly number) what size it is. But you can measure the bore. A 12 gauge is .729 inch, 16 gauge .662 inch, 20 gauge .615 inch, and the 410 is .41 inch.
Original flint or purcussion pistols by Henry Deringer could be anywhere from 28 to 50 caliber. Remington Arms made several different "Derringer" pistols (note the difference in spelling) ranging from 17 to 41 caliber. The most widely recognized Remington derringer is the over/under double barrelled Elliot's patent chambered for 41 rimfire cartridges. Modern copies of these are readily available today in 22, 38, and 45 caliber. Dozens (hundreds?) of other small, easily concealed, pistols and revolvers have also been called Deringer/Derringer/Daringer, etc, by most people even if not by their manufacturer.