Hi, all - I wonder if anyone can help to identify the issuer of this 900 gold medallion. Dia 22mm, 7.6grams. Proof uncirc.


Info
MCDXC11 - 1492
Reverse - the 3 ships of the first voyage - Santa Maria, Pinta, Santa Clara (nicknamed Nina, the girl)
Obverse reads XFERNANDXETXELISABXREXXREGX
Reverse reads XANNOXDOMINIXMCDXC11XPLVSXVLTRAX
Plus Ultra - "further beyond", the motto of Spain
Any help or information on this medallion would be very much appreciated - thank you.