I think brown was the norm for your gun. But if you like black and white do not be shy about doing it. If the buyer had asked for black and white every maker in GB would have done it is a second to sell guns. We get so obsessed about factory original that we forget that factory was just the default finish. If a buyer contacted the factory with a request about just about anything they would have made the gun to specs for just a few dollars more if not for nothing extra. I have seen guns with nickel plating which was factory, gold washed parts, stocks altered, barrels choked or shortened as requested. You name it the buyer could get what they wanted if they had the coin.