This is a production used and original group of pieces of concept art and model making spec drawings. It was in use by Greg Jein for the creation of the models for Star Trek The Next Generation. This set is from the making of the Enterprise. These are printouts with hand written notations for edits and changes to the models for the series. It is from 1987. Feel free to ask me any questions you need to know and I will definitely hit you back with my best answer. Good luck, and enjoy!