The owner of 100103, also a pista, thinks it is from 1962-ish.
Barry Scott, known for high prices on ebay, sold a pristine chromovelato Frejus pista frame. It was $2500 or best offer, so the final sale price is unknown. He is willing to wait forever for the right buyer. That said, I think you can get a fast sale at $800, and if you are willing to wait, $1200-$1500.