London Classical Theatre Concert Urban Sketch Painting Postcard

US1 A beautiful specialist and carefully sourced undated but modern origin plain back postcard (does not have a divided back with address section but full message area on reverse) of a classical concert from a London theatre and a stunning artists impression of this beautiful view that is completely unique souvenir being of an urban style work of sketching with reverse notes how the artist had it featured in a bestselling book of this kind too with artist details on reverse unused and mint