I claim the ornamental design for a field stretcher board, as shown and described.
FIG. 1 is a top elevation view of a field stretcher board embodiment, the bottom side view being identical;
FIG. 2 is a side edge view of the field stretcher board embodiment of FIG. 1, the opposite side view being identical; and,
FIG. 3 is top edge view of the field stretcher board of FIG. 1, the bottom edge view being identical.
The field stretcher board contains circular openings through the thickness of the field stretcher board, the circular openings positioned about the perimeter edge of the field stretcher board, as illustrated in FIG. 1.
The length and width dimensions of FIGS. 2-3 represents a maximum length and a maximum width of that depicted in FIG. 1, and thus, FIGS. 1-3 are presented as reasonably possible to be of the same scale.