
Hi Michelle, Please post a larger, clearer image oriented upright, if you can. This image may be too small for us to confirm the type.
Grills were not used on this stamp issue.
Determining the color from a posted image is essentially impossible, unfortunately.
This design was printed in four types:
#25 - Outer frame lines at left, right, top, and bottom (no inner lines on sides)
#25A - Outer frame lines at left, right, top, and bottom (inner line on one or both sides)
#26 - Outer frame lines at left and right only (frame lines extend beyond stamp design)
#26A - Outer frame lines at left and right only (frame lines do not extend beyond stamp design)
These lines are visible in the below illustration. With these descriptions, maybe you can describe what your stamp's features are.

The following link will show these details visually:
http://www.stampsmarter.com/feature...Plating.html