Hand blown bud vase black cobalt blue threading signed Flanagan

Very unique hand blown bud vase with a twist of black glass thread on the neck area. The other has cobalt blue threading. Hand signed Flanagan on each and what looks like a D or maybe the number 10. Also some pressed symbols in the bottom which I can not make out. I have 2 and they measure 9" tall. Price is for each but will sell at a discount if you want the pair. Also specify if you want the black, or the blue threaded.