It is a some kind of commemorative stamp (likely not for postage) of the Roman city of Emona that was 2000 years old in 2015. So date of issue is probably 2015 or 2014. Not in any catalog I have.

"Emona (Aemona) was a Roman castrum, settled by colonists from the northern part of Roman Italy. It was located in the area where the navigable Ljubljanica came closest to Castle Hill. The river played an important role as a transport route for the trade between the city and the rest of Roman empire. From the late 4th to the late 6th century, Emona was the seat of a bishopric that had intensive contacts with the ecclesiastical circle of Milan, reflected in the architecture of the early Christian complex along Erjavec Street in present-day Ljubljana. Emona's infrastructure had a rectangular layout, enclosed by a stone wall and double moat. Within the wall was a grid of rectangular streets that divided up the space into residential blocks. The central urban space was the Emona forum, which served as the administrative, public, religious and mercantile centre of the settlement."

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Thank you for the information. Yes it could be a personalized stamp.

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