Omega Speedmaster X-33 Skywalker (gen 3) Caseback w/"FLIGHTMASTER"?

Hi,

First post here. I recently acquired an Omega Speedmaster X-33 gen 3, and noticed that the caseback had inscribed "flightmaster" in it (see pictures below). I have never seen an example that had this. I checked on Omega's website but those done have "flightmaster" in the caseback.
Does anyone have any information on the various casebacks that Omega may have released through the Gen 3's lifespan? Could this be a "fake" caseback?

Thanks!

For all interested, I emailed Omega and they just responded. Basically, they did have some of their X-33s casebacks engraved with “FLIGHTMASTER” on them.