Mailed from Inner Richmond, San Francisco on October 13th.
Sunset Trailer Court at 2963 Santa Rosa Avenue
@38.4048551,-122.7150434,277m/data=!3m1!1e3!4m5!3m4!1s0x8084482bd0f84f83:0xa4832de7b2100554!8m2!3d38.405121!4d-122.714748″> https://www.google.co.uk/maps/place/296 … 122.714748

Street level:
@38.4052716,-122.7135801,3a,75y,271.05h,86.48t/data=!3m6!1e1!3m4!1spuV7ni852uCdjRuY2URjnA!2e0!7i13312!8i6656″> https://www.google.co.uk/maps/ @38.40527 … 312!8i6656

Thanks very much Richard.

When he referred in the letter to ‘last night’, that would imply he was writing the letter on Sunday. So I wondered if he mailed it on Sunday, the 12th and it sat in the US mail box until the Monday pickup, though the postmark stamp is PM rather than AM on the 13th.

Have you ever knocked on a random door at the trailer park and asked any questions?

Yes, likely mailed Sunday and stamped Monday. It would be an expensive knock at the trailer park for me with a 5,300 mile journey to achieve it.

Agreed about the expensive knock!

I’m just wondering if there’s any significance to Z’s whereabouts, if he mailed the letter Sunday as opposed to Monday, or vice-versa.

Well you could argue that he may have lived in San Francisco rather than the Vallejo area, if he had a standard 9-5 weekday job. Otherwise, why travel that distance just to post a letter on Sunday. If he lived in Vallejo and travelled to San Francisco to work each day, then an early Monday morning posting of the letter, could be franked the same day. Being that I believe the Zodiac lived in Vallejo, in hindsight, this to me probably seems the most likely.

These are interesting thoughts.

My sense though is it would be rare for someone to commute from Vallejo and work in or near the inner Richmond. Much more likely, that person would work downtown.

So if he lived in Vallejo and worked 9-5, either in the east bay or SF, I can’t see him mailing the letter in the inner Richmond on a Monday.

This would tell me, either:

a) He lived in San Francisco, or

b) He mailed the letter on Sunday.

However, the fact that the letter wasn’t postmarked until the afternoon on Monday would indicate it was mailed on Monday. If it were mailed Sunday it likely would have been postmarked Monday morning.

So I think I’d conclude that either he lived out of the city but didn’t work 9-5 . . . or he lived in the city.

For my two cents’ worth (ah……make it a dime because of inflation , but when I worked in San Francisco, we had plenty of people who commuted from Vallejo……and these were the days before BART. I don’t know if anyone pinpointed where Zodiac lived, but I can definitely tell you that plenty of people did make the commute from Vallejo (and further) to San Francisco. I made the commute from the far east bay.

Trainmaster