Publisher: Davidson Brothers
PM: July 17, 1906
I'm guessing this is from the 1920s but really don't know. Netherwood was a guest house, and apparently the last residence of occultist Aleister Crowley.
"Johnny had owned and run, with her husband Vernon, a large, gabled Victorian guest house named Netherwood. The property stood in its extensive 4-acre grounds, wherein were outbuildings, a lawn tennis court, a large garden, shrubbery and many trees, on The Ridge, a road running across the flank of the upland area behind Hastings, about 500 feet above sea level. Netherwood's situation afforded extensive views of the town, its Norman castle, Beachy Head and the sea, which were doubtless part of its albeit wind-blown attraction to visitors. " http://www.21stcenturyradio.com/articles/03/1001231.html
Publisher: Photochrom Co.
"MacIntrye's Series--Fort William"
The observatory was in operation from 1883 to 1904, and now only its ruins remain. According to the John Muir Trust, which owns the land, the hotel referenced in the card was a "sometime temperance hotel annexe".
Publisher: California Art & Engraving Company
PM: none, looks 1920s judging by the car
The "trail of the Missions" is also called El Camino Real. It started in San Diego and went up to Sonoma, past San Francisco. Much of US 101 follows El Camino Real.
Publisher: Coombs & Dilks
PM: November 9, 1907
Message on back rather disappointly only says "With love from uncle". Here is the carnival's site: http://www.bridgwatercarnival.org.uk/
Artist: R.J. Dymond
Publisher: Hills, Crown Pottery & Art Shop
Hills was a local Broadway shop, so it appears they commissioned Dymond for this card. Most frequently his cards were published by Charles Worcester in the "Chic Series".
Artist: R.J. Dymond
Publisher: Charles Worcester & Co.
There is an alternate colorized version of this, which I will post at some point in the future. This card is part of Worcester's "Chic Series," which most commonly features cards by Elmer Keene.