This is a custom made brand new never used vinyl cover for a Mesa Boogie Mark IV 1x12 combo amplifier.
Here is a link to the amp that this cover is for: https://legacy.mesaboogie.com/support/out-of-production/mark-iv.html. (The amplifier is not included). The amp measures 18 3/4" wide x 17 1/2" high x 10 1/2" deep (at the bottom). This cover will also fit several other Mesa Boogie amps with the same measurements.
The vinyl color is dark hunter green and has gold tinsel piping along each side at the seams. It also has a flap that tucks underneath the handle.
(The pictures of the cover were taken on a different amplifier which is the reason for the misfit.)