The name on the toe plate is most likely an owner of the gun. If the maker signed the gun, you should find a name, or initials, on top of the barrel several inches behind the rear sight. If there is something there, please let us know. If we could locate the gunmaker, then the owner was probably in or near that county, and it would simplify research to locate him.
There is no "W. B. Dickert" listed as a gunmaker, so most members on this site will not be able to assist you in identifying the man. If you want to locate him, and see if there is a family connection with gunmaker Jacob Dickert of Lancaster, PA, I'd suggest finding a library within driving distance with a good genealogy department, and go through census date of PA beginning with the 1840 census, plus check 1850 and 1860 as well. If you can't do that, perhaps an internet check or call to the PA state library can put you in touch with a researcher there who could check the records for you at a nominal charge. You may be able to identify the owner of this rifle. With its back action lock and lack of a cheekpiece, I would suspect it dates somewhere from the 1840s to 1850s. Shelby Gallien