The 7D mag was only made for a few years and they sold around 19,000. The last one produced would be around 38 years old now.
Its supposedly one of the rarest maglites made. I have no idea about the significance of the added supreme lettering.
Was this company around 38 years ago?
I found some interesting history on the 7D maglite. Maglite: More than a Cop light: 1979 to 1982 7D Lights
No way I would pay that much but to a maglite collector its the “Leonardo da Vinci’s ”Salvator Mundi”“:https://www.washingtonpost.com/news/morning-mix/wp/2017/12/07/leonardo-da-vincis-salvator-mundi-which-sold-for-450-3-million-is-bound-for-the-louvre-abu-dhabi/