Without delving into deep research, it appears that Paulson started manufacturing 43mm clays sometime in the late 1980s (the Dunes house mold 43mm chips and Aladdin's IHC and house mold 43mm chips were all issued in 1989). By the early 1990s, 43mm chips were becoming pretty common in many new casino chip racks, typically for $1000 and $5000 denominations but occasionally as tournament chips.
I dd not research when Paulson's larger 47mm, 48mm, or 50mm clays first appeared, but I think it's safe to say that the 43mm chips appeared first.
I also did not research the timeline for ASM 44mm chips, or the for the wide variety of non-39mm jeton sizes offered by B&G. Most inexpensive plastic chips produced in China were initially 40mm, and many still remain so today.