The first Norimitsu of is anchored by a single dated work, a signed no jū Norimitsu and dated the twelfth month of Kagen 3 (1305), designated at the eighth session. The published sources record that 「初代則光は長光の門人と伝え」 (the first Norimitsu is traditionally said to have been a student of Nagamitsu), and they note that besides this there survive with two-character signatures of the kind seen on Nagamitsu and Kagemitsu, and with a long no jū signature. Of the date itself they write 「この短刀に見るごとき嘉元の年紀は貴珍であり、他には例を見ない」 (a Kagen date such as this bears is a rare treasure, and no other example is known). He is distinct from the far better known Norimitsu of the mid- period, the smith of so-called Eikyo- celebrated as Kansho Norimitsu, whom the sources name only to set the earlier master apart.
The Kagen is a standard uchi-zori blade with a somewhat thick , recalling a . Its is with a tendency to , and stands out. The is mixed with angular, -like , with strongly visible, in with a bright ; the runs and turns back in with a long return. The sources observe that 「一見地刃の出来が景光を思わせるものがあり」 (at a glance the workmanship of the and temper has something that recalls Kagemitsu). The below the on the is a later carving.
Two unsigned have been given to him on the strength of that manner. One, and slender with deep curvature, a high and a small , has a tightly packed with and , and a temper in a tone mixed with small , small and somewhat angular elements in , with fine and . The sources judge these features 「鎌倉末期の備前物の中でも則光にもっとも擬せられるものであり、古則光の所伝は首肯し得る」 (among late works, the ones most readily likened to Norimitsu, so that the traditional attribution to Ko-Norimitsu may be accepted). The other carries a gold-inlaid attribution to Norimitsu with the of Kokan, eighteenth head of the house. Its is mixed with and densely forged, with fine , fine and ; the is a florid of round-headed with and , and entering well, -dominant with . For the sources this evokes the main line of the late period, calling to mind 「長光あたりを髣髴とさせるものがある」 (something reminiscent of Nagamitsu and his circle), and they find Kokan's appraisal fully appropriate.
The record of the first Norimitsu therefore rests on three works: one signed and dated in the angular manner of Kagemitsu, and two attributed that show throughout and a temper ranging from a restrained -based to the full of Nagamitsu's school.