Interesting Middle Eastern Pottery Vase (Iznik ?)/Signed /Unknown Age

Found this little beauty at GW this morning. It's 7 "tall x 4" in diameter. It seems to walk the line between Asian and Middle Eastern design. I looked at a few "Iznik" vases online and they seem similar. The body is a gray green color glaze with blue, yellow, and light green painted designs. There is a bit of damage to the body. A nice impact chip on one side. There's also a nick in the base and on the top edge of the rim. It appears to be made of red clay. There is a mark on the bottom. It looks like Arabic to me but I'm no expert. Can anyone translate ? -Mike-