No it is not. All those coins in Silver the Die has a crack on this region of the coin. In fact it is a marker for some varieties. From 1932 till 1964 inclusive all the Quarters has this Die Crack. This one it is longer because the
Die Deterioration and age, This was happened because the Master Die Crack and then was transmitted to Master Hub and so long in the Die production. So it is normal to have for all 1932 to 1964 Quarters. Your coin it is Type A and every coins in that time period on the time has Die crack starting from UN down. By the dimension I will state it is an VLDS (very late die stage).