Would this mark make the chisel older than the others.
Not certain.
According to Barley,
Turner, Naylor & Marples at Northern Tool Works, Sheffield, 1876 - 1887
Turner, & Naylor - Same address, but without the Marples, 1895 - 1907.
It is likely that these makers in other partnerships may have been in business prior to 1876.
Various names crop up repeatedly , sometimes related, sometimes not sometimes without any connection, in the 19th C tool industry.
Sorby, Turner, Marples, Tyzack etc.......
Partnerships came and went with regularity in those days.
I'll be the first to admit that there are others on this forum who know more about the history of tools, especially in Sheffield than I do.
I hope that it's a good user, given its age. A picture would help!
Good luck.