The ornamental design for double sign holder bracket, substantially as shown and described.
FIG. 1 is a perspective view of a double sign holder bracket, showing my
new design;
FIG. 2 is an end elevational view thereof, shown on a smaller scale;
FIG. 3 is an elevational view of the opposite end thereof;
FIG. 4 is a perspective view thereof, shown on a smaller scale.
The bracket is shown fragmentarily in FIG. 1 to indicate indeterminate
length. The sign and signpost are shown in broken lines in FIGS. 3 and 4
for illustrative purposes only and form no part of the claimed design.