Help identifying these pistons

It's not just the F that tells it's a forging. The centering hole is the first clue, and the inside picture looks smooth like a forging. A picture of the pin boss area would clinch it. I have an old TRW catalog at home, I will look it up tonight. By the way, I don't think the piston is junk just because the valve hit it, especially if it is forged. Just clean up the sharp edges.