Here is one of my mezuzas:
The mezuzah, I was told, is of the highest quality, purchased from a wholesaler in Jerusalem. The scan I did did not come out very good however (click it to see it larger).
What I note anyhow is that the shin of Shma Yisrael has "extra" taggin beyond the standard, although it's hard to see in this image. Same for the shin of "ukshartem".
Also the ches of "elohim acherim" has 5 taggin, whereas the others don't have those.
Can anyhow shed any light on these differences?