What does OMS mean?
1984worldcoins
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So, what is the meaning of OMS on this coin? And why regular strike, since this is clearly NOT a regular strike? If it is not an error (since there is no mention of it), is it a pattern or trial, by using another metal? The normal strike is using brass. Maybe I could get an official response? Thank you.
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Off Metal Strike?
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Near OMS , on the image from the PCGS pages, it says regular strike, so I do not understand. Also, there is no explanation on the PCGS pages for OMS abreviation. And why is put up there and not lower, like it is the case for some other coins?
The (regular strike) could be that PCGS didn't find it to be a trail/pattern piece but why it says OMS and not mint error I have no clue.
https://www.coincommunity.com/forum/pop_profile.asp?mode=display&id=102076
https://www.vamworld.com/forum/memberlist.php?mode=viewprofile&u=2220
https://boards.ngccoin.com/profile/61076-johnhenry9009/
https://www.mycollect.com/Jonhherny9009
The "Struck on CuNi Planchet" text on the label would seem to be a major clue.
I assume they wouldn't add that if it represented the normal composition.
Here are 2 examples I found online, why is mine worded in another way?
And, here are two examples similar to yours.
Source: https://auctions.stacksbowers.com/lots/view/3-VAZ2J/mexico-mint-error-off-metal-strike-struck-on-silver-planchet-20-pesos-2019-mo-mexico-city-mint-pcgs-ms-63
Source: https://auctions.stacksbowers.com/lots/view/3-RP0UO/mexico-mint-error-off-metal-strike-on-aluminum-bronze-planchet-2-pesos-2019-mo-mexico-city-mint-pcgs-ms-65-gold-shield
Serious question, NOT snark - Is it possible that the PCGS 'approach/label format' has changed over time?
As an aside, in the OP you requested an official response from PCGS. If that is still the case, I suggest 'flagging' a PCGS staffer (e.g., PCGS_Hy).
I am guessing off-metal strike?
"Regular Strike" I presume mean it's a "business" strike, not proof or "specimen" or other special striking or finish. And it's not a mint error, because they were intentionally struck in a different medal.
I prefer calling them abschlags, probably a bad German pluralization.
Ed. S.
(EJS)
I did more research and this is what I have found:
There was a 1980 pattern/test (prueba) for the Mexican 20 centavos “Cabeza Olmeca” struck in copper-nickel. It’s cataloged as KM-Pn218 and commonly cited with a listed mintage of 8 pieces.
Year: 1980 (pattern, not a circulation issue)
Composition: copper-nickel, 3.0 g, 20 mm
Attribution sources: Numista (with Luna Herrera’s Las Pruebas de la Moneda Mexicana del Siglo XX cited) and a Heritage Auctions listing noting the “mintage of 8” for the Cu-Ni piece.
This coin has been sold in 2009 as a pattern and it has a CuNi planchet.
Maybe the same planchet type has been used to strike my OMS coin from 1984. Was this made intentionaly or by mistake?
Nobody seems to know.
Also, it is imperative for me to get Luna's book!