Kaiji HQ Swinging Figures (カイジハイクオリティ/HQぶらぶらフィギュア) were made by Seven Two and released early 2012 to promote the anime's second season. They each stood around 70mm tall and had a more glossy finish than other Seven Two products.
These little figures described as 'Kaiji and his swinging buddies' at one point by the production company came in five variants:
Kaiji (underground)
Kaiji (above ground)
Hyoudou
Sakazaki (his affectionate nickname in parenthesis)
Unnamed blacksuit
Despite one of the images showing a little 'zawa' tag on the chain, apparently the figures don't actually include this. It's unknown why, but one blog user amusingly commented on the matter suggesting that the finished product was so cute that the production team was in shock and forgot to add it. This is unconfirmed.
Though it is interesting to note the png of kaiji with the zawa tag also exists as a version without the tag. It's unknown if it was photoshopped on or photoshopped off, but only seems to appear in that one advertisement.
This same user also pointed out that Endou and Ichijou were omitted from the collection (despite appearing in other seven two projects), and suggested it may have been because Endou ran away with the winnings and Ichijou was dragged underground at the end of the season. This is unconfirmed as well, due to Ichijou and Endou both being unavailable for comment.
They sold for 500 yen each.
