Some of the factors that can affect the value of a Guardian American Model of 1878 include:
* Condition: The condition of the firearm is one of the most important factors in determining its value. Firearms in excellent condition, with little to no wear or damage, will typically sell for more than those in poor condition.
* Rarity: The rarity of the firearm is also a key factor in determining its value. Firearms that are rare or scarce will typically sell for more than those that are more common.
* Provenance: The provenance of the firearm, or its history of ownership, can also affect its value. Firearms that have been owned by famous or notable people, or that have been used in significant historical events, will typically sell for more than those without such provenance.
If you are interested in buying or selling a Guardian American Model of 1878, it is important to do your research and consult with a knowledgeable expert to determine its value. With careful research and appraisal, you can ensure that you are getting a fair price for this rare and desirable firearm.