Ignition coils

[Boydskyking]

My ignition coil on my 1980 911 was dropped one of the terminals became loose and finished the coil. In buying a new coil I ended up with three , two new ones with a silver case both Bosch and a used one with a blue body and I think it is also a Bosch. In checking the resistance as per the instructions in my Bentley manual none check out right. One of the new coils checked out to be on the Primary Terminal 0 and the Secondary terminal 6.0, the second new coil check out Primary terminal 0 and the Secondary 0, The used coil checked primary terminal .003 and the secondary terminal 10.3 . which is the right coil. My manual says if the coils does not meet specifications they are to be replaces. The specification are Primary.. 0.4--0.7 Secondary 5.0-8.7 Do I have three bad coils ? I can not believe I have three bad coils.I need some of you guys that are electrical expert to guide me
Thanks