Classic Battletech poster which looks to date from 1986, given that FASA is advertising the Black Widow (1985) & Fox’s Teeth (1986) Scenario Packs.
[Edit 7/2/2020: Sold at auction for $130.28]
Tales of the Black Widow Company & Fox’s Teeth cover art by Jim Holloway.
Note that this is the preproduction “topless” art that never made it to the release Tales of the Black Widow. A bit more about that here.
See Also: Battletech Posters at the reference site