Stallzer is exactly right.
And for the imperfs, the reliefs are different than the perforated stamps.
And, the reliefs are different for the plates which printed the Type V stamps, than the plates that the other perforated Types came from.
So, the bottom line is that you could study this stamp for the rest of your life, and still not know everything about it.
I became interested in the 1c perforated stamp, which is the 1c 1857, when I started trying to find a Type Va stamp, which is a variety of the Type V, but very scarce. The nice thing about the Type V stamps are that they are plentiful, collectable and you can find many of them very inexpensively. I've always liked the fact that 3 of the most studied US classics out there are inexpensive, so anyone that wants to collect or specialize in these stamps can afford to do that: 1c 1857 (Type V), 3c 1851 or 1857, 3c 1861.
So, the Type V is reasonably priced, and also was printed very poorly. It was a good thing for philately that the stamp was poorly printed because (almost) each unique position on each plate is identifiable to the exact position because of unintended plate marks, blisters, cracks and mottling. To be able to find the exact plate position of a 1c 1851 or 1857 stamp, 3 different references are a must:
"The US One Cent Stamp of 1851-1857" by Stanley Ashbrook, which is the book that started it all, and is the "Bible"
"The United States One Cent Stamp of 1851 - 1861" by Mortimer Neinken, which does not replace, but makes many corrections to the Ashbrook book.
AND a Great Website:
"The One Cent Franklin Plating Archive" by Richard Doporto, which is found at this URL:
http://www.slingshotvenus.com/Frank...hv_Main.htmlStallzer, feel free to continue! I'll start to talk about the Type V stamps specifically over the weekend, and will show an example of each relief.
I also want to point out that I'm still a beginner with the 1c 1857's. Art Launier specializes in this stamp, mostly specializing in finding "curls" which is where a hair or filament made its way onto the plate during the printing process. The person who posts on this website who has the most knowledge on this stamp is without a doubt, Winston Sinclair. And Winston has been a tremendous help to all of us, and he is an asset to the SCF community, the VSC community and the hobby of philately in general.
I'm not planning on getting into a lot of details, and will take some liberties-- if you want details, you should really consider first joining the US Philatelic Classics Society, and also consider finding a copy of Ashbrook's or Neinken's book.
So, have a great weekend!
Hope this is helpful-- Ray