Early Breast plate – query is this an armourers mark

[A Senefelder]

ever, do you have a view as to country of Origin, I am leaning towards Italian simply from other examples I have seen.

Nothing that would definitely nail it down. The Italians did somtimes do roping ( the small chisel cut angled lines on the rolled and counter sunk borders ) in a tighter set like this but the radiating pairs of rayed lines from the waist to the arm and neck opening and same paired lines around said openings for decoration can be found around the continent in the late 16th and earlier 17th century.