OPA tokens

Does anyone have any knowledge about OPA tokens? There was recently an article about them in Coin World, but I don't get it. I saw it at my dealer and have some OPA tokens that I have never wondered what to do with them.
Anyway, in the article, they talk about a rarer mint mark, the red tokens with "MM".Well, I have one of these and have no idea of value or exactly how rare it is.
Can anyone help?
Anyway, in the article, they talk about a rarer mint mark, the red tokens with "MM".Well, I have one of these and have no idea of value or exactly how rare it is.
Can anyone help?
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Comments
The check letters when charted form a nice little rectangle and their layout forms a definite pattern with the exception of the MM and the MV. The MV probably should not exist at all and the MM is most likely an error. All of the other dual letter tokens are blue tokens not red, and the MM and MV are the only tokens that start with M. But there is one dual letter combination that should exist but doesn't. There is no blue WW. On the tokens they used the same punch for both the M and the W. I think the red MM's were supposed to be blue WW's. By the time they discovered the error some MM's had already gone out but they scrapped the rest and did not proceed with the blue WW because they were worried about a counterfeiting problem having two tokens with near identical markings. (Yes during the war they did have problems with people using pain to change red tokens to blue and blue tokens to red.)
No one today really knows what the significance of all the check letters was. The tokens were made by the Osbourne Register Company of Cincinnati OH but requstes made to them yeas ago for infomation about the letters was denied. It seems the information about the check letters is still classified information for reasons of national security.