I suspect this is an unpublished coin of Magnetes in
Thessaly. I checked Rogers' book on
Thessaly and there are no lyres. The reason I suspect
Thessaly is that many of the coins break the
inscription MAGNH-TWN and write it on two parallel lines as your example does. The
fabric of some coins also seems similar to yours.
As archivum points out, the Magnesia in
Ionia has coins depicting lyres. So it is also a
good candidate.
Magnesia in
Lydia uses MAGNHTWN but seems like the weakest candidate of the three.