Usage of contractions and short-forms can be very confusing. Lesson 11 in the Literary Braille Instruction Manual covers Short-Form words in great detail. There are no special rules governing the usage of the short-form for O’Clock. It does not matter whether it appears in a title or the body of the text. It’s brailled the same way.
RULE XVI. 47.b. Note: Short-form words which are common words are not to be considered as proper names