1L312  Day and Night Model

What a great design.  I can almost see the boss coming into the Telechron model shop at 4:05 on a Friday asking for a lighted commercial clock.  The engineers, in disgust, grab a 1F312 and a gooseneck lamp off the desk saying, "Fine.  He wants a lighted clock.  No trouble at all..." drill, drill... hammer, hammer...  Voila! The 1L312 with time to spare yet!