Since Gold Dollar/Double Arrow str8s have turned out to be so good I took a chance and purchased a few Wing Sung fountains after I dropped my Omas the other day in the airport. Wing Sung has a lot of models and the 616 (large) looks and feels just like the Parker 51 (I have two I used to compare.) I bought two of the 616 (black and burgundy) and both write and feel excellent. These are bottle fill, you squeeze the stem to fill, no adapters or cartridges which is awesome. Very inexpensive for a good product. The Chinese are really stepping up their game. Highly recommended.