I've never seen a straight grip two trigger splinter forend 16 ga all factory original 21,but I've only been watching the market 20 years- emphasis on straight grip factory original- maybe seen a 20 ga,or two. The earliest 21's were mostly two trigger, boat paddle stock,splinter forend, extractor models in all gauges and were always a good bit cheaper, until maybe recently? The 21 market has been a bit of a roller coaster ride