I think Richard may be referring to this.

It is all too easy when looking at the early grills to forget about the forms of their essays. This grill type is listed in Scott as 79-E15d and is sometimes called an all-over "music box" grill, because of the distinctive nature of the grill points. In this essay the points are essentially pin pricks, and do not have any of the features we normally expect to find in the issued grills. In this example the pin points are "points down" which is opposite the direction of the normal A grill.
Normally these points show very well, but when they have been flattened they are obscured and may be mistaken for the issued grill. When I first saw your picture of the
obverse reverse, I immediately thought of this essay.
Here's a comparative closeup of an A-grill on left and the music box essay on the right:

What do you think you have?