It's an official, authentic Lynx development kit, which we purchased from Songbird Productions (who in turn purchased it from another developer, that made Lynx games during the system's time on the market). I'm not sure which other games it was used to develop, but for certain it was used to aid in the development of Zaku, specifically the audio portion. As it states on my sales page, the kit comes complete with the original "Handy" development environment software, written by Epyx.
Thanks for your interest.