Hi thank you for writing in, however we need to see a photo of the mark. Could you please upload a photo in a follow-up submission. Good quality green jadeite is quite valuable.
If you cannot upload a photo, use a magnifying glass, preferably with 10 x magnification or a jewelers loupe and examine the letters again. See if you can determine what the last letter is. Look at details like the style of the font and if there is a cartouche behind the letters. Then look at the shape of the cartouche. These details are all-important when identifying hallmarks.
Then you might like to examine the jade and determine if it is nephrite jade or jadeite ;-)
