Join Date: Sep 2008
Location: Bavaria, Germany - the center of 15th and 16th century gunmaking
Please forgive my not answering back any earlier.
It is a Styrian spear from the Graz armory, made in the 1570's. It is the only one known to retain its original octagonal haft which is branded with the inventory stamp of the Metropolitan Museum New York in around 1900 and must have been deaccessioned of later.
Interesting enough, there are still hundreds of these spears (Froschmaulspiesse) preserved at Graz but all their round hafts are replacements.