PATENT LETTER from Queen Victoria on parchment to Monsieur Jean-Jacques Théophile Schloesing and Monsieur Eugène Rolland for their research into the manufacture of sodium carbonates. England, 1858, No. 644. With wax seal representing Queen Victoria on horseback and crowned. In its box. The whole in its box stamped with the great gilt arms of England. Traces of damp and wear.