I think they are letters as I've seen pictures or others with different letters, like "bf" or "eh"
"ca"
"ed"
so it seems a code, I think one letter year and second month? but 'o' as a month doesn't make much sense.
@anidel started
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I think they are letters as I've seen pictures or others with different letters, like "bf" or "eh"
"ca"
"ed"
so it seems a code, I think one letter year and second month? but 'o' as a month doesn't make much sense.