Ian brought up the subject of Japanese crossbows, this is the only photograph of one that I am aware of, the Met supposedly has one that was donated by George Stone but there is no images of it available that I can find. I have not been able to find any images of the one that Ian mentioned from the Royal Armories collection.
Eric, The one in the Metropolitan Museum is illustrated (very badly) in Stone's Glossary. It apparently has a partial signature burnt into the wood that reads ... Kunitaka and has the grip carved with clouds like the Royal Armouries example. That in the Royal Armouries formed the subject of an article in the Royal Armouries Yearbook Vol 3 for 1998 and is unsigned but has a number of superbly lacquered Togukawa aoi kamon on the tiller. Re-reading my article I see I made reference to a Japanese repeating crossbow in Musee Cernuschi in Paris (wrongly identified as Chinese. I also note I found an illustration of a repeating crossbow in Kobayashi, S; Buki Nihiaku Zu, Tokyo 1846. Nevertheless, they remain very rare weapons that seem to have been exclusively aristocratic toys made for the Tokugawa. The two examples in Nagoya are illustrated in their catalogue 'Military accessories of a Daimyo Household', one having a slotted barrel and a string for converting it into a stone-bow. Ian Bottomley