Blue jug - marked with letters "AT" and more markings

Good day everyone. I was revising my collection of pottery in recent days and came to the realization that I have quite of a number of the pieces which I am unable to identify. Some signatures I could read but could not find the data on internet about the authors of the work, and some markings look for me like a puzzle.






This is a blue colored jug. If I am not mistaken, the form calls "bulbous". The jug is glazed inside and outside. The clay color is red.
On the bottom is marking done by hand and covered by glaze, which reads, as follows: capital "AT" letters, under it is a horizontal line = 1 cm, after it is a short vertical line, or number 1. Then the word "yold" next to it, and next line is the word "kin". Next line is a symbol looking like a vertical bowtie and something else next to it, I believe it is an oval. Maybe it is a stylized number "80". Maybe I'm mistaken about the word "yold", and it is a word "gold"?
Glaze randomly covered in small "holes" dot like sizes, and it looks like the glaze wasn't able to cover the surface in their placements. On the touch there is also small "bumps" here and there, like small particles covered by glaze. Color looks like it was accurately and evenly "sponged". I hope it is visible on photos.
Size of the jug is 9 1/2" tall and approx. 6" in diameter in its widest part. Base diameter is 3 1/2".
The jug was purchased in Florida in an estate sale.

If somebody could help with identification, that would be so wonderful. Or maybe somebody knows what is "yold kin" (or "gold kin") means?
Thank you in advance.