browning 10ga

recently received Browning Invictor bps field model 10ga 28in,vent rib,left side receiver 2 flying geese,leaf pattern engraving whole side with signature Michael collins (looks like) Right side has 2 turkeys,same leaf pattern as left side with initials T.C. also has gold trigger.Can sombody tell me what it is and what its worth.Can not find anything similar on any web site.also gun suposedly has never been shot.