Looking for help in interpreting this listing in the Unitrade 2022 catalogue, please. #926Bcs singles are described as frame-tagged (GT4), with no indication of any paper fluorescence. The #926Bd singles -- 926Be, 926Bdis and 926Bdiis -- are listed with DF, LF and MF fluorescence respectively, but without mention of any edge tagging, ie. no GT4. Is this correct: no paper flourescence in 926Bc stamps and no tagging in 926Bd stamps? Thanks in advance for any clarifications on these.

Hugh