> J. L. S. Co
Assuming owners mark, possibly J. L. Swain , Sr, DBA...
also with Charles Swan & Joshua G. Gray (Somewhere in PA or NC or both)
Only a weak guess, but would date it mid 1890-1910...
(The company had a patent for a railroad tie, but the patent was cancelled, they seem to have gone broke shortly after)
2 other uses, a company in texas (grain dealer), and a much later surplus outfit (1960's)...
Or something else entirely, always a hazard guessing owners marks ;P