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dsc93135.jpg

Although the overall engine has a serial number of J-2111, the thrust chamber itself has a unit number of 2113.

Apparently, it was not uncommon for Rocketdyne thrust chambers to have a different serial number than the completed engine; in this widely-used F-1 manufacturing photo, the thrust chamber on the right side of the photo has a serial number of "2010" while the nearly-completed engine on the left is engine F-2010.

 
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Time picture taken Mon Sep 9 13:08:04 2013
Location picture taken Building 4205
Marshall Space Flight Center
Huntsville, AL
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