The five original citranges, produced in the early 1900's, were Rusk, Willetts, Savage, Colman and Morton. See my web-page
http://www.homecitrusgrowers.co.uk/citranges/usdacitranges.html
I checked the size of a golf-ball. It is apparently 42.67mm minimum. So the closest of these citranges is the Rusk at 51mm which could fit your description.
(Note that in the following picture, the top row shows a trifoliate orange and an immature Rusk citrange.)
Of-course there are plenty of other citranges developed more recently, but I've found it difficult to find photos and information about them.
Mike/Citrange