If it's frost or salts, I've never seen or heard of anything like it on old bricks. yes, I think it's original brick. "OK, here's my suspicion: That is an added brick veneer. Why?" 1. "The chimneys are on the outer walls, but don't appear to be flush with the outer brick work". I think they line up with the walls perfectly. Look at the width of the overhang at the gable end. 2. "The white flashed brick on the right half of the home aren't consistent with old bricks". Why? How can you tell? 3. "There definitely aren't header courses". It's certainly hard to tell from that small photo, but I think I'm seeing courses that contain headers. It's not very common, but it looks like Flemish stretcher bond (different from Flemish bond). Mark, If you have the original, larger sized pick, you can send it to whk3(at)entermail.net.