Littleriverphil: You mentioned that one of the postcards was postmarked Salsig, California. I'd love to see the postmark, given that the post office was only in operation a few years (1904-1912) when it changed its name to Manzanita (1912-1915). I imagine both are very scarce postmarks to find these days.
I searched long and hard for both of those postmarks, until one day while communicating with an eBay
seller whom I had bought a small lot of Humboldt county covers from, and mentioned that I also collected Mendocino county covers, she asked if I also collected postcards and then told me of her mother's and aunts postcard correspondence, most of which came from Salsig.
Actually two of the above cards are from Salsig, the log train is also from there, mailed 19 days earlier than the Sea Foam card.
Here's another Sea Foam card mailed from Salsig, this time leaving Mendocino Bay, followed by it's postmark.
More Salsig postmarks.
This is my earlist Salsig postmark, 4 months after the earlist known use of Salsig's Doane cancel, used as a reciever here.
And heres my only Manzanita postmark, minus a stamp. I have to wonder about the date, to me that sure looks like 1910, but Salsig became Manzanita on Sept. 9, 1912 and remained open until June 15, 1915. While there is only the bottom half of that final number visible, it doesn't match any of the 3 years Manzanita was open. Postmaster set the year date slug wrong?
Alan H. Patera's compulation California Poatmaster Compensation
lists only the odd numbered years of operation.
Oddly, the book does not list Manzanita