You suffix could be SA, SAS, LA, LAS, OR XAS. It all depends on the length of your shaft.
If your motor was registered with Honda when it was bought, I can check tomorrow to know for sure. The Honda data base is down over the weekends for maintenance.
In the meantime, if you measure the distance from the point the the motor clamps on the transom to the horizontal fin, just above the prop, that will tell you the shaft length.
If you measure around 15 inches - it is an SA If it has electric start - it is an SAS
If you measure around 20 inches - it is an LA If it has electric start - it is an LAS
If you measure around 25 inches - it is an XAS They only came in electric start
It is possible that it was not registered, since back in those days, the warranty cards had to be filled out and sent in.
You could still find out by calling Honda Customer Relations, if I can not find it. They have access to a lot more than a dealer does.
Mike