Good point. Both of my grip panels match, as to color and condition, but I believe they are replacements. The reason is, neither has the serial number on it. The right panel is unmarked. The left one has a crown/H cartouche, and the letter "L" stamped, just above the screw cutout, but neither is numbered. Even in my "novice" state, I would guess they're replacements. Have a look at the photo; if you zoom in on it a little, you can see the markings. You can also see a gouge mark, above the crown/H, but no serial number.
