You can and should correct it, acording to Rule 5-10, Timer's Mistakes:
ART. 1 . . . The referee may correct an obvious mistake by the timer to start or stop the clock properly only when he/she had definite information relative to the time involved.
ART. 2 . . . If the referee determines that the clock was not started or stopped properly, or if the clock did not run, an official's count or other official information can be used to make a correction.
The question then is what time should be on the clock. I know (but cannot find a reference) that you allow a 1 second delay. So now you must deal with the question of definite information. My take - If you have no idea what time expired between blowing the whistle and looking at the clock but you are certain it was 1 second or greater, you would reset to 4.3 seconds, because you allowed for the lag prior to looking at clock and your only definite information is the 4.3 seconds. If you are not certain that the time was 1 second or greater (or are certain it was less), you would have to reset the clock to 3.3 seconds to account for allowable lag time.
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