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In the academic year 1956-7 I acquired a model 4081-3 from a K&E sales rep. The serial number is 905366. Not sure if this is helpful for dating because K&E recycled their 6-digit serial numbers. The matching K&E leather carrying case is Model 4092-3S. K&E also sold leather belt clips that enabled students to wear their slide rules like swords. An annual visitor to the campus brought an engraving machine to personalize slide rules with the owners' names.. After a busy day or two, he moved on to the next college. Post was K&E's main competitor. Post slide rules had bamboo cores that provided very smooth movement, important for precise settings. Hope this is of interest.