As noted above the mei looks to be “Kaneuji” 兼氏 but it is roughly cut. Also noted above the date is 1940 (皇紀二千六百年 = Imperial Era 2600 Year) also very roughly cut. Although Kaneuji is a very old name in Mino, there is only one registered in WW2 Seki and he is Yoshida Reiichi (吉田鈴市). From the Seki registration list Yoshida Kaneuji was born Taisho 14 (1925) January 13 and registered on Showa 13 (1938) Sept 9 (living at Seki-cho, Naka-machi) which would be age 13. (this is a little odd for his age, maybe a deshi, and also he is the earliest registered in the list). For the blade shown in 1940 he would be age 15 (perhaps explains rough work?). The Sho stamp fits the age. However, other examples dated 1940 (Fuller & Gregory (1940)) and also 1942 (F&G (Seki stamp) and Slough (Seki stamp)) are better finished (also taka-no-ha nakago) and probably are nakirishimei signed.
Are they the same smith or joint work? Here are the examples for comparison. Fig 1, 2, 3 (Iryna). ) Fig 4 (Slough p. 72) Fig 5, 6 (F & G 1983) Fig 7, 8, 9 (Gendai Index Rick Stein).