Chris Craft prop numbers?

[bigbird]

G'Day all. Is there any one out there that may be able to help me de-code the numbers stamped on my prop.I have sent a lot of time with Mr Google and some of the books I have and I think I have worked out a few of the stampings but not all.
It appears to have started out as 13" dia. re. worked and crosed out the 13 with two parallel chisel lines and re. stamped 12" which it measures. The letters NiAL mean cast Bronze.

The ones that I would like to know are DYNO CUP followed by a space then 16 L could this be the pitch? and on the end of the hub are R803 and 180 degrees opposite are ck a space then ss.
I have no idea whether this is an original prop. it has pitting on all blades which makes me think it's been there for a while and it runs on a 1" shaft. any help would be welcomed.

I know that I haven't meet any one in the club yet but thank you for your help during the year, and have a Merry and Safe Christmas. Brian and Jann.