Sukeyoshi is one of the smiths the published sources name as representative of the Yoshioka school of , with Sukemitsu and the Sukeyoshi written 助義, a school that "flourished after the Fukuoka , from the end of into the ". His record is small: four and a prewar .
The published sources set the school inside the larger picture. The two great currents of were the and the , and the went on to flourish into the at Fukuoka, Yoshioka and Iwato. The name comes from the character carved on the tang, and the signatures take three forms: the alone, the with a personal name below it, or the personal name alone. His own carry the last two kinds, which is why a that keeps the at the tang end matters for placing a blade in the school.
The published sources define the Yoshioka manner against Fukuoka. They write that the school seldom shows the flamboyant large of Fukuoka, that within its " stand out", and that elements slanting in the reverse direction or bunching together are its point. His follow that description closely. Over an that is closely packed or flows in places, with and a rising , often a , the temper is mixed with , and entering, slanting in places and at times -dominant, or a -based line touched with that slants here and there, the tightening on the . The turns in a .
All four are shortened. One keeps a two-character , two a three-character , one of them reading Sukeyoshi zō at the tang tip and the other cut large with a fine chisel and somewhat worn, and on the fourth only the character survives at the tang end, the rest of the signature set into the as a . Of that the published sources write that its and "may be called typical of the school, and it is sound as well"; of the three-character one at the tang tip, that it shows the features of the Yoshioka school in full; and of the other, an mixed with under a vivid and a small-patterned temper of with and , that the comparatively prominent and the somewhat small-patterned show the Yoshioka character. The sources add that its signature, though somewhat worn, is valuable simply for surviving, that and are sound with good , and that the forging is notably fine.
The fifth piece is a large "handed down in the Uesugi family and said to be the work of Yoshioka Sukeyoshi", with a long tang pierced by four peg holes and a mounting recorded in the Uesugi treasure register.
Yoshioka with a surviving signature are uncommon, and a designated Sukeyoshi comes to market only rarely; his interest lies in how clearly his few blades show the school's restrained, -led .