The Jinhao 611 is one of the several pens that I bought from ebay. They came to me shipped in a padded brown envelope rather than "coffins" or boxes. If I remember correctly, I paid no more than $7 for each pen + shipping.
I purchased 3 of them because I was attracted to the simple streamline shape. I wanted a pen that would be very comfortable for someone who uses mechanical pencils because they are so straight and plain.
I liked the barrel colors that were shown in the picture of the ebay auction. One is a solid color in the red, rosy, cyan range, the others are a russet and a blue that appear to be acrylic with the depth of color that sometimes goes with that sort of plastic.
All three are straight, uncharacterized barrels. They are .65oz/18.42g; 5 1/8 inches / 156.2 centimeters in length capped; 6 1/4 inches / 190.5 centimetrs posted; and .39 inches / 10 mm in diameter.
The nib appears to be stainless steel. The ones that I have are fine nibs. They come with standard Jinhao converters. I had hoped that they would take international cartridges because I do not use fillers or bottled ink.
I removed the plunger filler and inserted an international cartridge. It took a lot of fussing about with it to get anything to flow. The first thing I noticed was the tines of the nib were tight together. I had to use a syringe to pump water through it. It really didn't take any pressure to get the water to flow through it, just a quantity enough to fill the grip and the nib. When I finally did get the water to flow through it, the pen leaked from every possible joint. The grip is in 2 pieces and it leaked through where they are pressed together. After I got the ink flowing through it, I began to have hopes that it would work better, which it did for a short time. By the time I finished writing one full page, the pen was leaking from where the barrel threads on to the grip as well as from where the grip is pressed together.
All together, I'd give the pen a 2. Perhaps it's a chance I took in buying these pens. It's possible that some are better perfomers than others. They are nice in appearance, and seemed at first impression to be of at least fair quality, but when put to the test they did not rise to the occasion. It is possible that using the filler is the answer. That remains to be seen.