Just a follow up for those following this thread....
So I call Browning and they confirm for me that this is indeed a 1962 grade III engraved firearm by Master Engraver Louis Vranken.
I asked the gentleman on the phone if they offer an appraisal service. He said "no" and said the grade III firearms are prized among collectors and he himself would buy the gun from me.
Without any pics....just based on description...he offered me $4k.