1898 Derringer, not 1899.
The 1899 is not an "antique" unless it is a cap lock, flintlock or matchlock, or muzzloader made in 1899, or if does not use ammunition commercially available and is a replica of a pre-1898 Derringer.
The 1899 is not an "antique" unless it is a cap lock, flintlock or matchlock, or muzzloader made in 1899, or if does not use ammunition commercially available and is a replica of a pre-1898 Derringer.