The ornamental design for an elasticfingerstrap and its base, as shown and described.
FIG. 1 is a top front perspective view of an elastic finger strap and its base showing my new design; the top rear perspective view is a mirror image of the top front.
FIG. 2 is a top front perspective view of the base without the strap attached.
FIG. 3 is a bottom elevational view of the base without the strap attached.
FIG. 4 is a bottom elevational view of the base with the strap attached.
FIG. 5 is a top front perspective view of the elastic finger strap and its base, shown installed in an unclaimed environment; and,
FIG. 6 is a left side perspective view of the elastic finger strap and its base, the right side perspective being a mirror image thereto, show in use.
The broken lines in the drawings show unclaimed environment only and form no part of the claimed design.