Quick history on Bekler signatures:
Bekler's first importer was Irving Korn & Royal Meerschaum, beginning circa 1972 or 1973; his pipes sold through Royal carried a hang tag reading, "This pipe was carved by Ismet Bekler, Turkey's foremost sculpter(sic) and carver of meerschaum." As far as I know, nothing made for Royal was signed.
After Royal, he was imported by Golden Horn, and circa 1973 or 1974, began signing. First signature known is "BEKLER," then "iSMET," then "ismet Bekler." Most of his Golden Horn work in 1974 was also dated.
He was taken up by CAO circa 1977 or 1978, and at that time-- or, more likely, very shortly after-- it changed to the common "i. Bekler." Early CAO work sometimes also had "© CAO."
Only his series for CAO ever had an edition title and number (ex: "25/100"), these also being dated. He did some series for Golden Horn, but these all had stickers on the cases instead. Golden Horn put labels with a model name on all their pipes; Beklers said "Exclusively by Gold Horn - Genuine Bekler," and a second label IDed the series: "Collector's Special" (usually heads, such as famous composers), "Mystery Castle" (Bekler's easily-identifiable castles), "Imperial Heroes" (Middle Eastern or Asia bearded faces worked into flowing abstracts, sometimes with nude women) and "Beyond Imagination" (full abstracts).