This listing is for a matched set of six vintage Texas Instruments TTL logic ICs, all manufactured in 1968, during the earliest years of commercial plastic‑DIP TTL production. These chips include:

- SN7400 (quad NAND) – internal code N60A 6829 (x2) 

- SN7402 (quad NOR) – internal code N61B 6827 (x1) 

- SN7404 (hex inverter) – internal code N63D 6826 (x3)

All six devices carry TI’s N‑prefix internal production codes, used in the 1960s to identify package type, mask family, and assembly/test revision. These markings are highly valued by collectors and semiconductor historians because they document TI’s early plastic‑DIP manufacturing process.

The date codes (6826, 6827, 6829) place all six chips within a four‑week production window in mid‑1968, strongly suggesting they originated from the same piece of equipment. These early TTL devices were commonly used in minicomputers, calculators, test instruments, and industrial control systems of the era.

These chips are ideal for collectors of early integrated circuits, restoration specialists, or anyone documenting the evolution of Texas Instruments semiconductor production.