Unknown "268" DIP-14 IC
This might be a TTL version of 74F286 9 bit parity checker (1987), but no guarantee: they might have just used the same number.

I suggested T74LS268B1 because it is a little-known SGS 74 series 268 about which I have no further information, but even that only because that I think that would be a pin-compatible part: with that '69-'70 date code, it won't be LS technology.