I'm taking it that is off the field can which you would be correct but there is also on the casting the date wheel that should have a 70 in the center of the wheel. The dots in those spoke'e of the wheel is the month so there should be at least five spokes with dots since that is a late April date. A rule of thumb the field can date should be before the casting date? If there is on dot in the let say in the fifth spoke that would be the first week of May your field can is the fourth or maybe the fifth week of April.