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The engine's serial number, "NA115101", is stencilled on the bottom of the thrust chamber.

The Performance Data for Individual Atlas MA-2 and MA-5 Engines report indicates that this particular thrust chamber was part of an MA-5 engine system (in which the two LR-89 thrust chambers shared a single gas generator). This thrust chamber and its counterpart together generated of 309,016 pounds of thrust while undergoing their final acceptance test on September 23, 1960.