Annoyingly I have lost the address of the museum in Rome and when I visited very quickly only photographed their cittern. The museum appears to publish some photographs now which I have seen via a friend in Rome. Some further measurements quoted from their catalogue (which you will have to translate yourself!):
Misure: L. tot. cm 61,5; L. piano cm. 34,3; L. manico cm. 35; L. corpo: alta cm. 14,5, centre. cm. 13, inf. cm. 17,3; pf. cassa cm. 11,7; (diameter) foro arm. cm. 6/3; alt. fasce cm. 7/10, cm 2/6; L. vibr. c.cm. 37,6.
If you would like to contact me off-list my address is in the Lute Society website.