There is 2 kinds of rod cover of FG-150.
The temple bell type rod cover
The shape from the light green label when selling it, to 1969 year making vicinity of a red label.
The triangle type rod cover
Everything began to be used from something of making in 1968, and was changed to this shape mostly in 1969 latter half of the year.
Even sale completion in 1972 is this shape.