We claim the ornamental design for the portion of a safety razor handle, as shown and described.
FIG. 1 is an upper perspective view of a portion of a safety razor handle.
FIG. 2 is a rear view thereof.
FIG. 3 is a left side view of FIG. 2.
FIG. 4 is a right side view of FIG. 2; and,
FIG. 5 is a bottom view thereof.
The broken line in the figures is for the purpose of illustrating portions of the portion of a safety razor handle and forms no part of the claimed design.