I have a Beretta Model 92 with no markings other than a 5-digit serial # on left side of frame. It has no letters before or after the number. On the left side of slide it has Pist. Mod. 92 Cal. 9 Para and BERETTA. The right side of frame and slide are blank. No country of origin. no import marks, no proof marks and nothing under the grip panels. In the book.... World of Beretta, it mentions some sample models that were taken to Brazil for the competition to for the contract because they weren't in production yet. Is it possible it could be one of those? Any info would be very much appreciated. I have contacted Beretta several times . They have researched it, but have not given me any info as of yet. They did ask me where/how did I acquire this firearm.