Interesting topic, Slayor
I've owned ten of these over the years - here in the USA, the vast majority of Hakims came from the Navy Arms wholesale buyout of Egyptian army airguns back in 1986, and the exteriors of these tend to look like they were beaten with iron rods. Internal condition has also varied greatly - although all of mine have been functional, the velocity ran from maybe 350 up to 520 fps.
Allegedly some were rebuilt sometime in their tough lives, and of the few I stripped, one was nearly pristine inside but the others had badly crushed and distorted springs. The one thing they all shared was excellent accuracy regardless of anything else! My "keeper" example had beautiful tiger-stripe wood hiding beneath a heavy layer of grime / dents / gouges - after only about 40 hours of sanding the wood and metal, a fresh shiny blue job, and a new oil finish, it looks really elegant.
http://i213.photobucket.com/albums/c...7/AG/Hakim.jpg
Sorry I can't help with serial numbers as I never recorded any (indeed, where does one look for the S/N - under the tap handle as on Falkes?)
Don R.