COIN (ROMAN)
Silver Roman Republican Denarius issued by moneyer L. Calpurnius Piso Frugi, c.90 BC (Reece period 1). 

Diameter: 17.34mm Thickness: 2.07mm Weight: 3.5g

Obverse Description: Laureted head of Apollo facing right with an oval symbol behind head.

Reverse Legend: L PISO FRVG[I] XXXII

Reverse Description: Legend below horseman galloping right, holding palm.

Similar example on the database: HAMP-1267E6 

Seaby, H.A. (1978) Roman Silver Coins: I. Republic to Augustus. 3rd edn. London: Seaby Publications LTD
Ruler: Republic
Moneyer: Calpurnius Piso Frugi, L.
Denomination: Denarius (Roman Republic)
Material: Silver
Obverse: Laureted head of Apollo facing right with an oval symbol behind head.
Reverse: Legend below horseman galloping right, holding palm
Reverse legend: L PISO FRVG[I] XXXII
Dated: -90.0 to -90.0
Weight (g): 3.5
Diameter (mm): 17.34
Thickness (mm): 2.07
Completeness: Complete
Preservation: Good
Parish: Welby
District: South Kesteven
County: Lincolnshire
Region: East Midlands
Discovery method: Metal detector