Weiß jemand Rat?
This actually sounds like an old club that may have also been offered "for free" at one point... there is also a L70 version of it...I think mobile players were snatching them up at one point.
So, players obtaining a club for free and then selling it back to WGT would be a racket. Not saying you did so. You may have been around long enough to purchase the club.
But, when I investigated the issue awhile ago... that is what I learned. It can't be sold back to WGT even though it suggest or indicates it has a credit value.