hello i was wondering what my ruger Mark 1 might be worth. i had it passed down to me. it is a Ruger mark 1 with a s/n of 78,xxx with a factory compensator on the end. has a pair of black grips and a pair of wood grips with a rest for the thumb. any comments would be helpful. had someone offer $175 but i believe i is worth way more then that. thanks.