I believe so too, but I have not found any documents, letters or anything else that support my suspicion that this card is signed by Baudouin of Ligne (12th Prince of Ligne).I think you mixed up Prince of Liege with the Princely house of Ligne.
Thanks for confirming that you too believe this is the Prince of Ligne. Baudouin is the only recent prince (12th) starting with a ‘B’ but so far I have not seen anything signed by him. Still searching for answers.I think anderst is correct. It resembles "Ligne" more than "Liège" and the initial is certainly a "B" and not an "A".
I'm sorry I can't be of further help with identification.
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