It looks like you're new here. If you want to get involved, click one of these buttons!
1955 sports issue errors
At the Mid-Cities stamp show here in Arlington Texas i found a C90 used pair with imperf between. I checked all the books and catalogs and found that Lothar von Saleski did show the C90 as C538a as a horizontal pair with imperf but not as a vertical pair. Does anyone have any more info on this ?