It's so exciting to find well weathered seaglass that still has the characteristics to be identified as what it used to be! For that, I love coke bottles. Though the colors of coke bottle changed over decades from clear to seafoam with blue or greenish tinge, their ribbed surface are unmistakable. I've found a couple of ribbed pieces that I could put my finger on immediately, other well weathered pieces blew their cover as well because of that unique color!
Have a look through your stash again and watch out for it - anything looks familiar?