The Prager Groschen (Prague groschen) was first struck in Bohemia as far back as the early 14th c. and survived for over 200 years until it was brought to an end under Holy Roman Emperor Ferdinand I (Habsburg) in the 1540s.
During that time, the basic design and legends remained largely unchanged, apart from spelling and style variations, with the Bohemian rampant lion front and center, and of course the relevant ruler listed.
I think this particular example was struck in Kuttenberg (the modern Czech Kutná Hora) and would likely date from the 1520s to early 1530s.
That being said, I wouldn't have been overly interested, but what got my attention about this particular coin (despite some strike and flan issues) was the retrograde (backwards) N's in the reverse inner legend; interestingly, the obverse legend has a "correct" N but is seemingly missing the final "S" in PRAGENSES!
I've seen a few different Ferdinand Prager Groschen before and none of them have had the retrograde N's.
I could not find this particular variant listed in Markl, although it appears to be a variant of Markl 1031, and I couldn't find a match in Saurma.
Anyway, here's a description, and the coin.
ca. 1520-1530 AR Prager Groschen (no date)
Ferdinand I Habsburg
Presumably a Kuttenberg issue.
Unevenly struck on a decent but worn flan. ~25mm.
Markl 1031 (some variant?)
Obv: Bohemian lion rampant in a beaded circle
Legend - GROSSI + PRAGENSE(S?), flowering vine/stem
Rev: A crown with three annulets left, right, and below, centered and encircled.
Inner legend - FERDINANDVS o PRIM * with retrograde N's
Outer legend - DEI : GRATIA : REX : BOEM +
Thoughts/opinions welcomed or further attributions!