Unpaid letter sent from St. Thomas to Nantes 24 January 1866 by French line B via St. Nazaire. Stamped French Octagonal “ST. THOMAS - PAQ. FR. B No. 1” and two-ring “COL. FR. PAQ. Fr. - 2 ST. NAZAIRE 2” in red. Erroneously stamped manuscript due mark “16” decimes and corrected to 10 decimes. In January 1866 the weight and rate changed from 7,5 grms to 10 grams per letter, and increased from 80 centimes to 100 centimes (10 decimes). Interesting letter.