When I think of single pontil slags, I think of the early Germans.
But you're right, from your pics with that style of pattern and pontil, Navarre is likely
From https://marbleconnection.com/topic/27321-peewee-pics-anyone-and-a-little-info-would-be-great/page/2/
Pretty sure I've got a blue, a purple, and a red one around somewhere too.
For me, it looks like some type of Joseph Coat pattern (although some might say a minimum # of colors required).
The whole "End of Day" terminology is another thing...I think the term was published in a couple marble books and imaginations ran wild.
Left one isn't a flaming dragon (wrong company, colors, pattern). Likely Alley, chance of Christensen with better pics.
Right one is a Peltier, I believe most people refer to this type as a Multi Color Swirl (MCS)
The article is a good read. Both processes described (hot punch, hollow cane) is more than you'd expect from the average "maker/hut" aiming for quantity. Thanks for the link, very interesting