In researching an item with the mark "DL", I came across this info as a possible match. 

Company: Daro Creations Inc Corporation 62 West 47th St, New York

Mark first used: 1982

Mark cancelled: 1991

meggiegirl on the ebay forums, had found this piece and was looking for info.  It matches pretty well, so it may be this company.  Thanks to meggiegirl for the fotos!