So, being the Prince fan (nerd) that I am, I was going through my 45's the other day logging them into my spreadsheet.  I happened to share this with an online friend who advised me that my list was incomplete.  So I bashed our lists together and found that may be 14 distinctly different US releases for When Doves Cry.  The majority of the differences are on the B side label for 17 DAYS.  I took the documentation from Sleevographia and fleshed it out with some of my research, even finding a 'Type 5' release that Sleevo does not show.  This is what I have gathered so far, if you have any  additions or would like to discuss, please feel free to comment below.  

If you are not able to visually tell the small label from the 'slightly larger' label, look at the red flower - if there is a white space between it and the edge, it is the larger label.  If the red part touches the label edge than it is the small label. Also on the small label, there is a 'ring of ridges' that circle the label.

Many thanks to Alex from Sleevographia for the use of a couple of images that I do not yet have.

Type 1a / slightly bigger label / and the REVOLUTION no font / small 17 DAYS

Type 1b /  small label / and the REVOLUTION no font / small 17 DAYS

Type 2a / slightly bigger label / and the Revolution font / bigger 17 DAYS

Type 2b / small label / and the Revolution font/ bigger 17 DAYS need this one

Type 3a / slightly bigger label / and the Revolution font / small 17 DAYS need this one

Type 3b / small label / and the Revolution font / small 17 DAYS

Type 4a / slightly larger label / and the Revolution font / bigger 17 days / end of flower above Warner Bros logo  Need this one

Type 4b / small label / and the Revolution font / bigger 17 days / end of flower above Warner Bros logo

Type 5a / slightly bigger label / and the REVOLUTION no font / small 17 DAYS / end of flower above Warner Bros logo  need this one

Type 5b /  small label / and the REVOLUTION no font / small 17 DAYS / end of flower above Warner Bros logo

Purple vinyl (and the revolution no font)

Black vinyl PROMO

Purple vinyl PROMO

Back to Back Hits   Special Surprise - Error Label. side a on the left, side b on the right. Side b plays 17 DAYS. Unfortunately someone decided to write 17 DAYS on the error label...