Test stickers reveal two black color options for the Apple iPhone 74
Both stickers show D10 in the area that identifies which model the sticker is for. At one time, Apple supposedly had three prototypes including the D10, D11 and D12. The D10 is reportedly the Apple iPhone 7 while the other two were for the Apple iPhone 7 Plus and the Apple iPhone 7 Pro. One report said that Apple had planned three models just in case yields of the dual camera it was going to use on the iPhone 7 Plus were too low. In that case, the iPhone 7 Plus would have had a single camera on back and a limited edition iPhone Pro would carry the dual lens setup and the Smart Connector feature. But since there were no problems building enough dual cameras, Apple did not need to produce the iPhone Pro. Feel free to take that story with a grain of salt.
In the slideshow below, you'll find the test stickers for both black-hued iPhone 7 handsets. To reiterate, the 128GB model that the first label was for sports a Dark Black color. The 256GB unit that wore the pictured sticker, is in Piano Black. And we threw in a third photo that will help you decipher the code used on the stickers.
source: @the_malignant via AppleInsider (1), (2)