Dean,
The Pac Ave card is one of my favorites, the scan doesn't bring out it's true colors. I think it may be from the 20's-30's. When I look closely, the dresses and hats on the ladies seem to be from that period. And just the style of the signs and the trolley cars. Not sure though.
Your cards are amazing, my husband and I are really into medieval times, roman times and ancient history. I've never seen any like those!