That is awesome...congratulations! I have never found a '70 from teller trays; all of mine have been found in rolls from boxes. I just found my 4th 1970 about a month ago. Welcome to the club!!!
I've got two 1970 halves. One from a cwr and the other from teller tray. When my teller got back from asking other tellers for halves she had the 1970 and said the other teller had been saving it. My teller said " it's really shiny, is it silver?". Looks like a proof coin I told her , as she handed it over. HH
Merc
Congratulations I too have a 1970 D. It was my first silver from a tellers tray now I'm doing about 6 boxes a month of half's and have been doing dimes lately about 3 boxes a month. But I love my 1970.