What Kind Of Pref Are These Green One Cent Stamps

Hello im not sure what kind of pref this stamps are I have posted a pic I have allot of stamps that have pref on 3 sides and straight line for the 4 side. I also have that are no pref but they are cut at the corners. any help would be appreciated

The first is a "US Automatic Vending" perforation, type 1. They are listed in Scotts Specialized in the Vending and Affixing chapter.

The other two are called straight edge stamps. Most likely from the imperf side of a regular pane of 100 [all panes of these had an imperf side], or the side of a booklet pane of 6, or even scissored from a regular stamp.

USAV's are considered more valuable - see ebay sold results for real world estimates. Straight edges are considered less valuable, these being near nil.

chasa,

thank you so much for the information well appreciated