Chuck, I looked at 19 Citation 110's on eBay and found three different front covers. #1-ribs, 4 long slots on the side, near the body, #2-no ribs, 4 long slots, as #!, #3-no ribs, carved (white) ring near the front of the side, 5 small slots at the break between the front and the side. I found no examples that combined the ribs and the carved ring. IMHO, the illustration in the 1966 catalog was a case of "artistic liberty", since it was a hand-drawn sketch, instead of a photo of an actual reel. Photos I believe, sketches not so much. It's my belief that the 4 long slots, no ribs is likely a 110 cover, the 4 long slots with ribs a 110A cover, and the no ribs, carved ring, 5 small slots a 110B cover.
As I've said before,so MANY parts interchanged throughout the Citation 110/Century 100 production run, and these reels have had so many owners, it's hard to know what you've got. Heck, even the side plates interchanged! You can put Century sideplates on a Citation and vice versa! During my Citation research on eBay, I came across a Citation 110B with a front cover, drag indicator and drag pointer from either a Century 135 or a Sprint 235! The left sideplate had been painted black, and the lettering rather crudely scraped clean. Frankenreel!
Ya just never know, bud!