Quote by Shabadabada View Post
The series prefix of this bayonet is いも, series 93. The second hiragana is shaped on a way which makes it hard to distinguish, horizontal lines are curved and reach the lower hook, giving this mark a rounded appearance.
Unlike the other series marks used by Hikari, which are easily readable, the 93rd series mark is a mess. I located a couple of other examples for comparison purposes. Hopefully, this will help others down the road.
Type 30 bayo find
Type 30 Bayonet makers