Hi Emmi,
I will do my best to explain, the differences are quite subtle. I meant that if the base was completely flat and looked like it has been cut across, then it would not be Czech. In my experience Czech bud vase bases are as you described, with a small indentation, a bit like a dimple. Czech bud vases usually (though not always) have clear stems and the bubbles are smaller.
I based my guess of Swedish on three things:
1) The bases and stems were the same colour.
2) The bubbles were a medium to large size, and controlled.
3) I made the assumption (maybe wrongly, I'm still waiting for Kieran to confirm that) that the bases were flat.
Had the stems also been narrow at the top I would have been totally sure they were Swedish, however I do have a few Swedish ones which are wider.
Nothings is ever definite is it?!!
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