In detail, I think this symbol is quite different to that previously posted ...
I could not disagree more. They are all the same object, each depiction being
executed according to the respective skill of each artist.
The upper example from Pergamon (detail below) highlights the difference and has all the appearance of a squid. The tentacles and body are very nicely detailed and the protruding end bars that define the form you are seeking to identify are completely absent.
I have seen a lot of squid, but nothing as awkwardly presented as you claim.
There are examples of squid depicted on coins, but they don't look like this.
There are no "tentacles", the lines you see are only weaker on the other
side due to lack of metal flow. One cannot focus solely on one single insignificant
feature to the exclusion of the whole rest of the image,
nor the others in the
greater group. Those "end-bars" as you call them are there, simply allowing
for lighting angles, unless you choose not to see them. Additional examples
of these coins will undoubtedly add to, and aid this conclusion.
If we follow your lead, then the object between the boar's heads above is a
mouse, with the tail cut off, and a stubby nose, and tensed up because it is
cold, and sitting on ball-bearing. On the other hand - no!
The next thing I expect will be someone calling this a false moustache!
Convince me with evidence, actual evidence. All the best,
Walter