The EL panel has a variant color, different from later production DSKY panels

The color of the panel is more blue with less yellow than we had expected. I dug through the NASA drawings that comprise the specification control documents used to procure the part. I did find that the first version of the drawing, 1006315, listed 5100 angstrom as the color. This is consistent with what I see on my panel.

EL panel showing the drawing number 1006315, without a revision

The back of the part has to include the NASA drawing number along with the revision letter. As you can see above, it is 1006315 with no revision. I judge this to mean that the part was a very early procurement.

The revisions of the drawing for the panel ranging from A to G all require that the light be emitted at 5300 A, thus being closer to the color we all expected.