Mysia, Lampsakos AR tetrobol 15 x 13mm, 2.1 g, 11h 4th-3rd centuries BC Obv.: Janiform female heads with circular earring. Rev.: AAM-YA; Helmeted head of Athena right. Note: The AAM- (I used a Y as it looks like a 3 point candlestick and I can’t do these letters or symbols)
The legend is ΛΑΜ / ΨΑ ( Λαμψα(κηνῶν) ) but written in boustrophedon: the first line from left to right, the 2nd line from right to left, etc.
I guess with yours being a tetrobol, it must have been roughly twice the size of that diobol I once had?
MALE & FEMALE HEADS Islands of Troas, Tenedos, late 5th-early 4th century BCE. AR Obol (8mm, 0.60g, 3h). O/ Janiform head, female on l., male on r. R/ Labrys within incuse square. SNG Ashmolean 1235; HGC 6, 387. VF
RR Anon AR Heavy Denarius -Quadrigatus - Didrachm (10 As) 225-215 BCE Incuse Roma Janus Jupiter in Quadriga Craw 28-3 Sear 31
POMPEY JANUS RImp Pompey 42-38 BC AE As Janus Prow Magnus S 1394 Cr 479-1 JANUS AS RR Anon AE As after 211 BC Janus I Prow Cr 56-2 Sear 627