I don't know if anyone is still looking at this thread but I have just begun a restoration on H/N 455. I have been in contact with Catalina factory support and they were able to tell me it was built in 1970. It is pretty rough. It was given to me from someone that was not using it and amassed quite a bit of sun damage and looks worn. I have opted to spend a moderate amount to bring it back into shape. Right now it is upside down on saw horses and sanded with 80 grit. I am waiting on paint from TheBottomPaintStore.com. I am also a Texas sailor (newbie), from San Antonio. I put the boat in the water a few years back when I first got it and it took on quite a bit of water. I have sealed the apparent leaks with marine putty. Hopefully I will be able to post some good before/after pics.