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Impossible to answer without a DETAILED description of ALL markings.
100-300 dollars
50 or so
50-475 usd
If your Navy Arms rifle is the lever action Yellowboy (reproduction of the Winchester 1866) they list for $400-500, depending on condition. The carbine version has a slightly lower value.
50-300 USD or so
Howard Arms was a name used by the Meriden Arms company from around 1905 to 1915. There are no records available to give you a better date. Their value is around $100.
10-50 USD or so
100 or so
The value of a Continental Arms company 20 gauge shotgun is dependent upon a number of factors. The age and condition of the shotgun would need to be considered when determining the value.
Victor Arms Company: Trade name used by the H. & D. Folsom Arms Company on firearms made for the Hibbard, Spencer, Bartlett and Company of Chicago. c. 1900. Value would be about $50-$75.
depending on overall condition $150 - $200