Russo...
".....make it look like one of my Kodachrome slides from roughly fifty years ago – such as this extremely fuzzy one taken on 08/28/67 with a cheap 2X telephoto extender attached to my Pentax 70-150 zoom"
I KLOVE your 50 year old shot! I will have to try this "technique" next time I get a chance. Creating an "old tyme look" is one of my passions, The closest I have gotten to the look your old photo has was with the use of a plastic Holga camera or Holga lens on a Nikon, as shown in my recent book "Nostalgic Photography of the Colorado Narrow Gauge" (available on Amazon).
Greg M., lost somewhere in South Carolina missing Chama