When I wrote my "first year" letter, I did say where I graduated from and I also said what I did while I was there.
This is what it said:
I graduated from Wellesley College with a BA in American Studies: American Education concentration, as well as my teaching certification. For my four years at Wellesley, I worked with toddler and preschool classrooms at the Wellesley Community Childrenís Center, as well as with first and second grade classrooms teaching literacy and math.
Looking back on it, that last sentences is a bit super-wordy. haha.
Anyway, it let parents know a bit about my background and they asked me about things I had done and how I had liked it, etc.
I didn't say it was my first year teaching, but I'm sure they could figure it out because 1) I didn't mention other permanent teaching jobs and 2) I look super young.