Hi Marius, I am joining the others. This is a nice classic shibriya from Jordan. I have seen a few that are virtually identical. This type is great because it is basic and well made, with only geometric decorations on no plastic or glass "stones".
Even without the date of 53, there are some features that show its age like: the decoration is made by simple engraving in straight lines, similar to Shayde78's shibriya in this recent thread
http://www.vikingsword.com/vb/showthread.php?t=23214 dating from about the same period. Later examples were either made by hammering over a template of with a zigzag line made by rocking the chisel while moving over the sheet-both are much quicker and more efficients methods.
The blade is a nice recurve with flat diamond cross section. Later blades have one side almost straight and a flat eliptical cross section.
So there is definitely a link between style and age or in other words - age does matter.
Eytan