File this one away under rarely-seen curiosities. Apparently, in the mid 90s Gretsch was still firming up the whole "jr" concept. So, the 6120S is a lot like the 90s single-pickup 6120-Jr.
They had a rosewood fretboard, single volume and tone controls on the lower bout, bound f-holes plain (not gnarled) strap buttons.
From Fred Gretsch:
"Early prototypes of 6120jr model were built as a single pickup model joined at the 14th fret. Just a few pieces like this were made."