I think it
might be the case that older six-stripe chips were made under the Langworthy name and have straight edges on the stripes, whereas newer six-stripe chips were made under the RT Plastics name and have angled edges on the stripes.
Here's a post where I dug up an old web page from The Poker Chip Company; it shows they were selling the angled-edge six-stripe chips a decade or so ago. I speculated that those chips were from RT Plastics, and then
@gmunny confirmed that RT Plastics was providing chips to The Poker Chip Company. Not definitive, but certainly suggestive.
Here are some retailers that are still advertising the angled-edge six-stripe chips. Dunno if those pages are up-to-date or not.
Note that one site says they're 10g, one says they're 10g and not metal slugged, and two say they're 8.5g. So are these different chips? Or all the same?
Note that Langworthy turned into RT Plastics, and also turned into Gamblers General Store, so probably the ones they have for sale now are leftover inventory made by RT Plastics. Or maybe it's new inventory, made to their specs by a factory in China? Dunno.
By contrast, here are some six-stripe chips with angled edges that are definitely
not what anyone is looking for. I ordered a couple barrels of these and can confirm they are metal-slugged and made from a hard plastic, very similar to dice chips. You could guess that from the description, which says they're 11.5g:
By the way, the chips actually used in the Sopranos episode may actually be the older straight-edged Langworthy chips instead of the newer angled-edge chips that people seem to be calling "Sopranos". It's hard to tell for sure, but looking at the screencaps the edges look straight to me:
So if I were going to engage in SUPER rampant speculation, I'd guess that some Hollywood props guy got his hands on a big batch of old Langworthy blanks somehow and used them in the episode, and then when it came out the RT Plastics / Gamblers General Store guys realized that they suddenly had a big potential hit on their hands, but didn't have the old Langworthy molds any more (maybe lost, maybe worn out) so they had some new molds made that were
pretty close to but not
exactly like the old molds and started cranking out new chips on the new mold to cash in on the sudden fame.
Total speculation here. Would love to know more.