Hi Michael,
A sword similar type of the sword under discussion is also dated by Thomas del Mar end of 17thC.
see picture. but maybe he has also read from Seitz
The sword you show in the last 3 pictures is a composite 2-hander.
with a cross-guard from the processional swords almost certainly made for the guard of Julius, Duke of Brunswick and Luneburg in Heinrich Grubenhagen.
most of these swords have original blades which are dated 1573,1574,....
a composite Guard of Julius sword with a similar blade as the composite you have posted has been sold by Sothebys 5-15 oktober 2005, schloss Marienburg and is dated end of the 16thC.lot 231.
lot 224-lot230 are original Julius guard swords and all dated 1573/74
I think the 17thC processional swords you are refering to have diamand shaped bars at the guard and flat blades. (Io flat bars and diamands shaped blades)
best,
jasper