And, the title Everybody's been hoping for...
it's John Lehti's Tommy of the Big Top #12!
It's a 2-issue run, #s11-12, despite Overstreet's listing it as 3 issues (10-12). Many on-line sellers list the 3, probably because of Overstreet, but they can only come up with copies & scans of 11 & 12. There are Australian reprints that ran for 13 issues, so maybe that caused confusion somewhere along the line.