Maurice, you mentioned literature on lantaka. Unfortunately the literature is scarce. One source is THE KERIS AND OTHER WEAPONS by Gardner. There is also a book by Alex Teoh called THE MIGHT OF THE MINIATURE CANNON. Another good source of information is this link and resource:
www.cannonsuperstore.com (scoll down to the cannon info and fake cannon info)
These and some research have guided me in my procuring my mini-lantaka, making sure it is not a fake and having appropriate patina. True bronze will have a brown-black patina first, then perhaps some blue green. Other aspects can be found from these resources.
Hope this helps.
