Construction workers in Spain doing routine work on water pipes have unearthed 1,300 pounds of ancient Roman coins dating as far back as the third century.

This discovery is especially unique because the coins show minimal wear and tear, suggesting that they were never in circulation, The Washington Post reports.

The coins were found on Wednesday in 19 storage vessels, called amphoras, in the town of Tomares near Seville.

Ana Navarro, head of Seville’s archeology museum, told reporters that the haul is certainly worth "several million euros," but declined to say an exact value.

“The majority were newly minted and some of them probably were bathed in silver, not just bronze,” said Navarro, according to The Guardian.

The coins feature the inscriptions of emperors Maximian and Constantine.

"What is incredible is a discovery of this size -- there are 19 amphoras, all complete, and I can assure you that they can't be moved by one person alone, because they weigh so much due to the coins inside," said Navarro, according to CNN.

Construction at the site has been suspended and planning for an archeological excavation is underway.

Andalusia’s Ministry of Culture shared several images of the coins on Twitter.

Primeras imágenes del hallazgo de monedas romanas de Tomares en el #MuseoArqueologico de Sevilla pic.twitter.com/5aK5fovNjj — Consejería Cultura (@CulturaAND) April 28, 2016

Ahora en @cuatro la directora del #MuseoArqueologico de Sevilla habla del hallazgo de monedas romanas pic.twitter.com/Vu4B4yjiJO — Consejería Cultura (@CulturaAND) April 28, 2016