The Royal Society discussed a silver box for Leeuwenhoek's diploma

March 4, 1680

According to Birch's The History of the Royal Society of London, (vol. IV p. 16), at the February 23 / March 4, 1680 (O.S./N.S.) meeting:

That Mr. Hunt prepare a silver box for the diploma to be sent to Mr. Leewenhoeck