(Courtesy of Earl Battey)
From bottom to top:
Koishikawa 1st Variation Model 44 S#35,865
Kokura 2nd Variation Model 44 S# 64,214
Kokura 3rd Variation Model 44 1st Series S#8,583
Nagoya 3rd Variation Model 44 2nd Series S#2063
All of the Model 44's shown are totally matching, three are mummed.
Markings read (top to bottom) 44 Model.
View of rear portions, showing distinctive buttplate used on this model.
This photo shows the differences in the bayonet variations from 1st through 3rd, bottom to top.