Hi Ross,
Thanks for the info,I think now we can safely assume this is an original 1930ish Star. The next question that comes to mind is when was the design change made to the newer design? I just looked at another newer design San Diego Star and see no patent #,so no help there! As you can see in the pics this has a bronze center casting that the transfer bar rides on and the pressure screw cap is larger in diameter. After fixing what I could and putting it back together for testing,this luber ran smoother than any of my others (I have 5 including a nice running Phelps!) Thanks again for the info. If you can find out when this model was changed to the more modern model that would be of intreste and date this luber more precisely!