Hi Numerianus!
I think you are right! Here I have the information of Melville
Jones, A Dictionary of Ancient
Roman Coins:
SELLA. A backless seat (
cf. Pulvinar,
Subsellium) which among the
Romans often symbolised powers of various kinds (as the concept of 'the Chair' does nowadays). The highest magistrates of the
Roman state, the so-called 'curule' magistrates, used a chair in the approximative form of two Us, one inverted below the other, which was called a
sella curulis.
Military commanders used a chair in the form of an X with a small seat inserted into the upper
part. This could easily be folded for transport, and was called a
sella castrensis. A flat seat on four straight legs was associated with the
quaestor urbanus, and is therefore sometimes called a
sella quaestoria.
Beside this text is a pic of a coin with a similar chair like that on your coin. The comment:
Denarius of Q.
Pompeius Rufus, 54 BC. The coin names the
dictator Sulla (the maternal grandfather of the
mint magistrate) and
his paternal grandfather, both of whom
had held the consulship, and symbolises the office by representing a double or consular
sella curulis on each
side (of the coin).
This double or consular
sella curulis is the chair on your coin!
Regards,
Jochen