2806.52.37 Railmaster XXL - why does is say "Aqua Terra" ?

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I used to think Railmaster and Aqua Terra, are and always were two independent sub-collections in Seamaster.

Whye does caseback of this Railmaster say "Aqua Terra" ?
Ref. 2806.52.37, currently there is 8 watches for sale,
https://www.chrono24.com/omega/ref-28065237.htm

All stamped "Aqua Terra".. Why? 😕

 
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Case backs are correct...
 
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that's like asking why the Planet Oceans only say that on the back in the same manner but only Seamaster Professional up front

(also applies to all Aqua Terras ever)