Doesn't ring a bell. You have any idea whether it's Belgian or French? Since it does not carry a well-known name, everything will depend on the gun's grade and condition. If it's a fairly plain 12ga Belgian or French boxlock extractor, no serious issues, it shouldn't get into the 4-figure range, but maybe close. (They have gone up.) Maybe $5-900, if it's as I described. Higher grade, ejectors, high 90's condition, expect to pay more.