Re: Mercury clasic fifty age needed please Picture included
As Laddies mentioned earlier, the partial serial number you listed indicates that motor was built in Belgium (are you in Europe?).
1988 45hp motors started with s/n 9506022 & up
I'd say it is a safe bet to call it a 1987 45hp (4cyl) motor.
The oil inection system for that motor would have been mounted in the boat (Mercury Autoblend). They are not known to be very reliable in comparison with the newer oil systems, and may have been removed by a previous owner. You'd be best to just mix your fuel yourself (50:1) with that motor.
Good luck.