18 Ben Franklin Half Dollars, all from 1950 to 1963. Together these add up to 6.52 Troy Ounces (Actual Silver Weight), which at the December 18 spot value around $65.50/ounce equals about $427 worth of silver. Yours for only $390, about 9% under spot value.
While I am not a professional coin grader, I would guess that these would be graded from Very Good to Almost Uncirculated. So there are a few early 1950s among them with additional numismatic value. They are now
from 62 to 75 years old. They would make a nice holiday gift for a coin collector or silver stacker.