Pentax ME F with a special motorized lens, marketed in 1981, can offer AF, but, I believe, SF1 with a built-in AF motor should be the real first AF camera from Pentax.
The unique features on Pentax SF1 are:
- A central roof-mounted LCD
- An accessory mount installed on the right-side (behind the shutter button)
- AF/MF switch can be locked at MANUAL, no accident change.