rg Regulator - origin of the term?

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I just got hold of this 1948 beauty, ref. 2576 cal. 343rg.
I got a lot of very useful information from Desmond's excellent Centenary review.

But I cannot find any information about the origin of the "rg" term. Any information would be much appreciated!

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346641847_80fe68e6-2a5a-477e-bf9e-a6074e7e3ce8.jpg
 
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I've always assumed "RG" was the Omega code for "extra special regulator" as seen in this 30t2rg datasheet:
934224-a0fae73c1ccfe988a44c53e91ac0f09c.jpg

Calling @mac_omega for clarity 😀