1. Design: The Model 1868 was based on the Model 1866, which was the first centerfire cartridge-firing rifle adopted by the United States military. It retained the basic “Trapdoor” design, with a hinged breechblock at the rear of the receiver.
2. Caliber: The Model 1868 was chambered in .50-70 Government, which was a powerful black powder cartridge used in many early Springfield rifles.
3. Action: Like other “Trapdoor” Springfields, the Model 1868 used a single-shot, breech-loading design. The breechblock was opened by lifting a lever located on the right side of the receiver, hence the “Trapdoor” nickname.
4. Sights: The rifle was typically equipped with a blade front sight and a folding leaf rear sight graduated to 1200 yards.
5. Stock: The stock was made of walnut and featured a distinct “slanting” comb, which was a feature of many early Springfield rifles.
6. Bayonet: The Model 1868 was designed to accept a socket bayonet, which was mounted on the muzzle.
7. Production: Production of the Model 1868 was relatively limited, as it was quickly superseded by the improved Model 1870 and then the Model 1873 “Trapdoor” rifles.

In terms of value, the Model 1868 Springfield Trapdoor rifle is a collectible firearm, particularly for enthusiasts of American military arms. The value can vary depending on factors such as condition, originality, and historical provenance. As of my last update, a Model 1868 in good condition could be valued at anywhere from $1500 to $3000 or more, but prices may vary based on the specific rifle and current market conditions