IME, the 120 is a worthy Bantam bass, though presently worth under $200. While clearly better than the XB100, a few bucks more gets the workhorse 24-fret XB400 (caveat: I own three, so I'm prejudiced). The 120Q was the quilt-top version, made like 2001-2004. What has me curious is the four knobs; the 120s I've seen (two soapbar pickups) have had just 2 + switch, so you might indeed have an oddity.
Whatever the brand, I distrust anything labelled "pro" as this might mean top-grade USA-made... or bottom-end beginner gear.