Thanks guys! The voting for the slashed circle really surprised me since my well worn Real Book uses the -7b5 convention. But it's the 5th Edition dated 1994 so as one poster commented, maybe conventions have changed in more recent years.

But I also use the modern and FREE MusEdit software that has an extensive guitar chord dictionary and it uses the -7b5 convention as well with no choice for the slashed circle version either. Maybe it's just a font issue.

Thanks again for everyone's comments!

(-:

Jim