Hmm interesting. I wonder why the decision was made to use GPL, since, from what I heard, the transition from GPL to Proto-Germanic was made in the second half of the last milennia BC, so right in our timeframe. And while you could argue that what the Sweboz spoke in 272bc was maybe still more GPL-ish (I employ the overused "-ish" suffix to show that those change in languages were processes with probably no threshold to tell you "now it has gone from GPL to ProtoG), the units and most of the backround information about the sweboz are -afaik - taken from later sources and somewhat speculative for 272bc und thus you could also use Proto-germanic for EB. I'm sorry if this post is a bit confused/confusing I am tired.
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