A couple of pics would be nice. Did you buy it new? Do you have the original box? Does the Sig website have an image of one similar to yours? How about gun auctions sites? Google and Bing "Sig pistols" and see what comes up.
"A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed."
Life Member NRA
Life Member NAHC
Former President of the ECPT (Eifel Combat Pistol Team)