I've checked but there is no references that mentioned of Build 297 of NT 3.1 released in 1992 come with any TCP/IP stack.
It seems TCP/IP stack was still under development at that time and was not included in this early beta build, and it was only released in 1993 stable release. Perhaps the more correct word is not 'development' but 'testing' since they ripped the TCP/IP stack out from Spider system and there's a very high probability that the Spider stack itself was part of BSD codes.