Bakelite saddles. Not fibreglass.Historic fact 1: the 'Precision' bass doesn't The monicker 'Precision' meant a fretted neck and a bridge with adjustable saddles which made the intonating player-friendly, and were meant to be the selling factors (as well as a smallish size) of the new instrument - setting it apart from double basses.
Physical fact 5: to have THE REAL Precision sound you needs must have 2 large fiberglass saddles and a string-thru construction. You should also have flatwound strings as 'that is how it was meant to sound', but those are not inherent to the construction of the instrument
Physical fact 6: unless yours is an ash body / maple neck bass, it is not THE Precision 'how it was meant to be'.
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As you see, one can make as many idiotic statements based on truth as I just did if I only pick the arguments that, being absolutely true, absolutely ignore the real-life context.
Don't be like me, be better.
Don't think the saddles had anything to do with naming it a Precision bass. The original two strings per saddle thing is less than precise as far as intonation precision goes. Frets were definetly part of the precision selling point though