Like most advanced collectors, Klaus Rademaker tries to keep track of serial numbers within his collecting interests. Over the last decade, Klaus has managed to assemble a very accurate database of Exakta/Exa numbers that can used for collecting and/or identification purposes.
If you have an original unmodified Exakta that differs from the data, please write Klaus and give him your information. This will help expand the collector knowledgebase. Be prepared, he'll likely ask for photographs and/or detailed information.
For comparison and research information, the Exakta tables include statistics from Richard Hummel's book, SLR Cameras from Dresden and Aguila/Rouah's book, Exakta Cameras.
Abbreviations used are: A/R = Aguila and Rouah book, Exakta Cameras. KR = Klaus Rademaker, serial number observations. RH = Richard Hummel book, SLR Cameras of Dresden.
For better cognizance, I've reformatted Klaus' original list, crunched some numbers, cross-referenced the listings with A/R versions and included the "Read This Before..." page. The data easily demonstrates the immense variety in Exakta collecting and I hope you are able to utilize it in your collection.