FJS,
It would be helpful if you would post pictures of the gun.A photo of the whole gun,of the action,of the "forestock under lever", and of any marks under the barrels.While these may not be proof marks,they may help others on this site ID people that may have worked on it,which may help in "dating it".Also check closely for a "Crown V" on the rib near the breech which, if present,would date it even closer.Hammerless(triggerplate)guns really predating the proof law(you said it had no proof marks and was from 1890s)would be rare.
Mike

Last edited by Der Ami; 09/21/12 10:40 AM.