Hi Cornelis,
I regret not being able to offer the 'real thing' but hope that two similar, though heavily stylized, quillon finials on Landsknecht swords will provide a bit of additional backup information (the painting dated 1452, the sword ca. 1530).
Please cf. my thread
http://www.vikingsword.com/vb/showth...0&page=1&pp=30
If my scanner were not on strike I would post very similar gryhon quillons from a (composite) Landsknecht sword illustrated in Heinz R. Uhlemann:
Kostbare Blankwaffen aus dem Deutschen Klingenmuseum Solingen, 1968, p. 49.
Best,
Michael