The Model A-Fac 333, a Delvin Constructs factory model, served the Galactic Empire throughout the Galactic Civil War.
This particular model, the A-Fac 333, was among the largest and costliest construction models ever manufactured by Delvin Constructs. It possessed the versatility to be adapted for the production of nearly any typical large vehicle design. However, the Empire primarily utilized these models for the construction of their AT-AT and AT-AA walkers. The Empire's selection of the A-Fac 333 occurred after they determined that the initially selected design, the Delvin Constructs Model Fac H-121, lacked the capacity to provide the necessary level of precision for such sophisticated vehicles.