Albert G. Piguet, Le Sentier AN EXTREMELY RARE?AND VERY FINE?OPEN-FACED KEYLESS WATCH BASED?ON THE PRINCIPLES OF RESONANCE?WITH DOUBLE?LEVER?ESCAPEMENT AND TWO GUILLAUME BALANCES, IN ASSOCIATED GOLD CASE WITH EXHIBITION BACK MOVEMENT 1933,?NO.220, CASE 1970S
Albert G. Piguet, Le Sentier AN EXTREMELY RARE?AND VERY FINE?OPEN-FACED KEYLESS WATCH BASED?ON THE PRINCIPLES OF RESONANCE?WITH DOUBLE?LEVER?ESCAPEMENT AND TWO GUILLAUME BALANCES, IN ASSOCIATED GOLD CASE WITH EXHIBITION BACK MOVEMENT 1933,?NO.220, CASE 1970S