The long chisel is a "near miss" with the marking stamp.
L & I J White is what is was supposed to say. This a venerable old edge tool company.
Either you shot it perfectly on edge, or its a very narrow chisel?
If its 1/4" wide or wider across the cutting edge, then its just your standard professional grade bench chisel. (all pro chisels had 6" blades).
Turning tools are always tang chisels, otherwise the tool vibrates off the handle in use, and bad thing happen.
Bench chisels get pushed or pounded so the handle lasts longer in a socket.
Bench chisels with tangs were (are) also available, but they nearly always have a bolster at the handle (a swelling of metal) so the tang can't just get driven in and split the handle.
Turning tools don't get driven, so they never have the bolster.
Bolster or no bolster is how you tell a turning tool from a bench chisel at a glance, when there are no handles and they are laying in a pile. :)
If its 1/8" wide then its a cane chisel!
Pre-woven cane was (and still is) a miracle. Just chisel out the old spline, soak the new cane for a little while in warm water, and drive it into the groove with glue and the new spline. You can re-do a chair back or seat, or both, in an hour.
But you need a long skinny chisel to clean up the groove first.
Weaving mile long strips of cane takes forever to achieve the same result.
yours Scott