questions about cavalry shoulder doublings

[Marcus Julius]

The plate you posted is from the late second/third century and would have been fitted to a lamellar or locking scale cuirass. These had 'keyhole' fasteners. It's shape would be similar to this..

http://www.aeroartinc.com/aapub/rp07.asp

For an earlier reconstruction have a look at Marcus Junkelmann's site..
http://www.klassphil.uni-muenchen.de/~s ... elmann.htm

Good thing I can read German! Even being able to read everything, the only reconstruction that I saw on that site was the picture of him in Hamata?

Here's a link to the completely enclosed doubling that I was referring to:
http://www.romanarmy.com/cms/component/ ... temid,137/