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MMN-o ✅⃠ (mmn)'s status on Thursday, 06-Apr-2017 17:52:03 EDT
MMN-o ✅⃠
If it's not 13.56MHz (Mifare, NDEF, ISO14443) I'd guess it's 125kHz (easily clonable, EM4102).
How did you conclude it was not NFC?