IMO all museums should now, by law, list all their artefacts online, with detailed images and relevant information. Otherwise they are just black holes that swallow up and hide away all but the small percentage of items they choose to put on show. In 20 years of researching air pistols I have unearthed vastly more information from private collectors than any museum has been able to do. There must be many, many antique airguns mothballed in museums all over the world that have no online listing.

John