This one is a pretty zealous comp; it's kinda similar to a Boss CS-2 in tone but with a bit of extra vigour and squish. It's got a cool 80s-futuristic aesthetic and is fun for some big square cleans. 

Model: Aria ACP-1 Compressor
Made: Japan, mid 1980s (serial 140426)
Type: compressor
Power: standard 9v negative supply or 9V battery (not included)
Switching: buffered bypass
Equivalent new street price (approx): n.a
Mods: none
Accessories: no box or manual
Condition notes: used, few minor marks, very good condition