The Epiphone Coronet was introduced by Epiphone in 1959, two years after Gibson aquired the brand. Costing around $120 it was designed as a reliable entry level guitar. The Coronet was discontinued in the 1970s when production of Epiphone guitars was moved overseas.
In the late 1990s (around 1995-2000), Epiphone resissued a short production run of Coronets made in Korea. The earliest of these reissue had a six-in-a-row tuner layout with batwing headstock, but later models had a clipped-ear headstock with three-per-side tuner layout. Between 1997 and 1999 a Vibrotone tailpiece was an option on this model.
These reissued Coronets had two "OBL" pickups (compared to a single pickup on the original Coronet), with a single coil in the neck position and a humbucker in the bridge position, controlled by a pull-out tone knob to tap the humbucker. OBL stands for Original Bill Lawrence - when Bill was working for Gibson in the 1980s they used his German-made OBL pickups on several of their Gibson models. The Gibson OBL pickups on the Korean Epiphone guitars, however, are not designed by Bill Lawrence or made in Germany - just "the OBL tradename" on a line of inexpensive Korean-made pickups.
More information: Epiphone wiki
More information: OBL pickups