I have a postcard picture that was taken at DUVALL STUDIO 493 VA Ave, NW. Does anyone know when this studio was in existence. I am trying to date the picture. Can you tell by the clothes and hairdo? It is at my FTM site. Mary Van Ness (I think) Jan Parker http://www.familytreemaker.com/users/p/a/r/Janice-M-Parker/