Is marked with pencil as 136, which to me is incorrect. The paper is tight, very white, looks to have glue put under right hand corner, which would also means it was without gum. The letter is from Wall street, may 21st 1875. I put another a46a, next to it on one pic to show the difference in paper, and coloring of the stamp. That letter was from may 28th 1875.
Supposedly more rare on cover, used. No price even listed in Scotts. I will scan, or take any additional pics as needed. The item "US Stamp 1875 Scott 169 CV$30,000 On Cover BlueGreen, SpecialPrint, 3c" is in sale since Sunday, April 1, 2018.
This item is in the category "Stamps\United States\19th Century\ Used". The seller is "njdigger" and is located in Port Murray, New Jersey. This item can be shipped to United States, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Sweden, Indonesia, Thailand, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Bahamas, Israel, Mexico, New Zealand, Singapore, Norway, Saudi arabia, United arab emirates, Qatar, Bahrain, Croatia, Malaysia, Panama, Bangladesh, Ecuador, Egypt, Macao, Martinique, Peru, Viet nam, Uruguay, Brunei darussalam, Bolivia, French guiana, Guernsey, Gibraltar, Guadeloupe, Iceland, Jersey, Jordan, Cambodia, Liechtenstein, Luxembourg, Monaco, Nicaragua, Pakistan, Paraguay, Switzerland, Colombia, Barbados, Bermuda, Cayman islands, Sri lanka, Maldives, Oman, Reunion, Japan, South Korea, South africa, Chile, Jamaica, Philippines, Ukraine, Canada.