Interesting! I never noticed that. I just applied the decal without looking. By the way, it's Excelsior, not Excalibur. Consider yourself lucky to have gotten one of Gordy's decals. I got mine a few weeks before his printers started acting up. Not available now.
Below is a detailed pic of the CSM from Apollo 15. The vertical dotted line is on the actual module. And a pic of my decal on a Sat 1B clone, less the quad thrusters. Applied five years ago, maybe I'll finish it up by the Apollo 11 anniversary next month. Or not.
Cheers.

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