So these are champagne bottles and not wine? The left one's seam goes up to the lip. The one on the right is a turn mold bottle with of course no seam. Not the same type wine bottle you are referring to.Turning a bottle in a mold obliterates side seams. I can't recall ever seeing a French wine bottle with side seams. Terry's bottle appears to be a French champagne which must be a turn-mold bottle to be consistent with the form.
There is a subtle difference between the forms of champagne and burgundy bottles, but all these bottle forms are turn-molds.
Sediment trap is a collector myth. The kick-up began as a way to put a flat bottom rim on a free-blown bottle. The kick-up is retained in these French traditional forms, even though it no longer has any function. On early wine bottles, an exaggerated kick-up offered the bonus of keeping finger away from sharp glass pontil scars.
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