I just qualify particular Champs as 'newer' or 'new old-fashioned' WV Swirls, since Champion was pretty much in continuous operation in WV since the vinitage era. Mid-Atlantic made newer WV Swirls too. Sammy's are just new, I suppose. I haven't really thought much about a hard cut-off date, where I would start to qualify the phrase WV Swirl with 'newer' or "new" but I could probably come up with a couple if I cared more about it.
As far as big ones, Alley made plenty up to 1", and perhaps a few bigger. Cairo, Champion and Heaton up to about 3/4", maybe a few 7/8". Ravenswoods over 11/16" (3/4"-7/8") are uncommon, if I am not mistaken (ignoring the Paul Bunyans).