Welcome to the next level of collecting, PEE WIT.

HL105 depicts the FIRST Point Loma Lighthouse that sits on the bluff guiding ships to San Diego Bay. Since the harbor at San Diego is frequently fogged in, the lighthouse couldn't be seen above the fog, so they built the "New" Point Loma lighthouse down at the water's edge. Since the "New" one was "New Point Loma", the other one became popularly known as "Old" Point Loma. However, it's name is correctly "Point Loma". The label on the HL105 says "Old Point Loma", but the Flag says "Point Loma". On the GLOW version (HL409), I believe both the label and flag say "Point Loma CA".

As for the other questions on whether it's possible to amass a complete collection today, I'll leave that to those in the "By The Numbers" Forum

John