Contact Browning.
Your Browning model citori B525 over under shotgun was made in 2 models,the sporting and the golden clays.Both were made in 5 grades,from Grade 1 to grade 5 with ascending levels of embellishment.The golden clays has a oiled finished grade V stock with solid pad and schnabel forearm.engraving pattern that depicts the transition of a game bird to a clay bird in 24K gold.This model includes 5 midas grade Invector choke tubes.the sporting grade.
Try Midwest Gun Works.
You will need professional assistance from a stock maker.
Best left to a gunsmith
stock is standard american walnut, no stain.
Best left to a gunsmith with the proper tools.
Impossible to answer on the internet without detailed pictures.
Must be examined to be sure.
I would like to start out with I have never seen a Browning serial number as described by you.Are we sure that you have a Browning 16ga shotgun,or another made shotgun that may have used Browning,s patent?I must admit that I have never seen a straight stocked Browning shotgun or heard of one in my many years of collecting firearms.
Try Mid West Gun Works
according to Browning Service and a local gunsmith - YES