Monochrome Boy

I've mentioned R and I recently had a day out in Brighton, digging around in the Lanes for treasure and this was among the stuff we brought home with us. I was delighted to find this really very sweet monochrome watercolour of a young boy. There are actually two of them and they are so fine that we first thought they must be prints but there are a host of small differences between the two representations and the other one is monogramed MB