Got it... been bugging me for a while.
Lets see....
You didn't say only 47 where built....
You didn't say anything about the wing spar passing through the fuselage behind the passenger cabin without decreasing cabin volume....
You didn't say anything about it being powered by General Electric CJ610-5 powerplants....
You didn't say anything about it having swept forward wings....
In other words....
It's designed and built by HAMBURGER FLUGZEUGBAU GmbH (HFB)
Its a HFB320 HansaJet !. That front windshield is unmistakable !
I do believe you're right old chap!
I'm not well versed in relatively modern civvy stuff, but I thought it was something like one of the French, or in this case, German, 'biz jets'.
Wake up Gary....................it y--------------------o----------------u-------------------r t------------------u--------------r---------------------n.