Since Dettra Flag Co. first used their Bulldog Bunting brand in 1911, that does not help us to date the flag. Is the flag sewn or printed? Is Dettra's info printed on the heading or stitched onto it? Are there grommets in the heading? If so are they brass or zinc? Even with all these answers, it would help to have a photo. In nearly new condition 48 star flags are worth about $25, but you will see them priced from $35 to $200 by people who think they are rare.