I'm finally finding the time to look more carefully at the first issues (1860-1880) that I have (a few dozen)
I'm not expert enough to be able to identify genuine but at least I can try to identify the obvious forgeries!
I'm using Cockrill Booklet 4 (although many of his comments are that helpful in identifying a forgery); the notes on this website and a scan that someone posed on another website of Serrane's highlighted difference /www.stampboards.com/viewtopic.php?f=10&t=7381
Two questions that someone may be able to help with
Do the forgeries typically have gum on the reverse?
Or did the forgers not bother and simply print the stamps?
I seem to remember reading somewhere that "Monrovia" was the preferred postmark of forgers (often mis-spelled)
Does this mean that a stamp with another postmark (eg Robersport or Buchanan) is more likely to be genuine?