Antique Spanish Copper Currency

This is a Spain 8 Maravedís, 1818-J, struck under Ferdinand VII at the Jubia Mint in Galicia.
The identification is confirmed by the small J to the left of Ferdinand's portrait and the 8 to the right:

• Country: Spain
• King: Ferdinand VII, 1808–1833
• Date: 1818
• Denomination: 8 Maravedís
• Mint: Jubia (Casa de Moneda de Jubia)
• Mintmark: J
• Metal: copper
• Weight: approximately 10 g
• Diameter: approximately 29 mm
• Catalogue: KM#491
• Calicó: Cal#1552
• Áureo: Aureo#198
• Numista: N#14870
• Variety: Jubia, second portrait

The obverse inscription is:
FERDIN · VII · D · G · HISP · REX
meaning “Ferdinand VII, by the Grace of God, King of Spain.”
The reverse is more interesting than it initially appears. It shows the Cross of Don Pelayo, with castles and rampant lions representing Castile and León, while the central oval contains the three Bourbon fleurs-de-lis. A wreath surrounds the composition. The design was engraved by Félix Sagau y Dalmau de Galcerán.
The Jubia mint itself is a worthwhile collecting angle. It operated as a Spanish royal mint from 1812 to 1868, and this particular second-portrait 8-maravedís series was produced from 1817 through 1821.
Your example is well circulated but quite presentable. The date, denomination, J mintmark and essentially the entire royal legend remain visible. Ferdinand's portrait has substantial high-point wear, especially through the hair and facial detail. The reverse retains the main castles, lions, Bourbon shield and wreath but is also noticeably worn.
I would grade it approximately F15 to VF20, probably closer to F/VF than straight VF. The surfaces have an old dark-brown patina and appear reasonably stable from the photographs. I would not clean it.
The 1818-J is not particularly rare. Numista records it as Cal#1552 / Aureo#198, and an exact 1818-J graded VF sold for €10 plus buyer's premium at Katz in 2022. Numista's current indicative figures also place ordinary circulated examples broadly in the single-digit to low-double-digit euro range.
For this coin I would estimate:
Open auction: about 80–140 SEK
Realistic collector retail: about 125–200 SEK
Strong individual listing: perhaps 200–250 SEK
So it is not a major-value coin, but it is a good historical piece: Napoleonic-era/Restoration Spain, Ferdinand VII, Jubia Mint, 1818, and the old maravedí monetary system.