This is what I got back on the tankard.....This is a French tavern mug with typically square shaped handle which appears to have been made by Dresco in Paris, a firm that was founded in 1850 by two brothers, L. and P. Dresco, who individually were still in production into the early twentieth century. I have not been able to read the left hand initial but the shape of the border and the rough image of the central part and the brother's prolific output points pretty clearly to either of them jointly or separately. The marks round the rim are Excise marks struck when the authorities verified the contents regularly each year for accuracy of content. These are date letters used in the Napoleonic system originated in France in 1802 but if this mug was used after manufacture in Belgium , that country also turned metric in 1801 through an act issued in Paris, reinforced in 1814 and finally in 1855 during independence. The only two letters I could make out were for 1899 and 1901 but the mug could well have been made some considerable time earlier, which would be born out by identifying some earlier marks struck further back round the rim
