A silver 18th century oval sundial by Blondeau.
Unusually, this French dial is signed 'Nicholas Blondeau Fecit Milano'.
The reverse of the dial has a list of latitudes for cities within a range of 41 degrees latitude to 46 degrees latitude. The dial is housed in a simulated fish-skin case lined in red velvet.
For a similar example see item 48 in the Whipple Museum Catalogue, no.6.