Argentina. 1866. Stamp-less envelope to France from 'Guerin & Fils, Buenos Ayres' cancelled by British Post Office 'Buenos-Ayres' date stamp with boxed Anglo-French accountancy 'GB/2pk' (Van der Linden 1625), French entry cachet and rated '15' in red with Frontignan arrival. Superb item of accountancy mail paying the news-band rate.