How do you justify the view that the level of excellence of the Gupta numismatic art is not at all noticeable in later times?

Gupta gold dinaras represent the high-water mark of Indian numismatic art, and the view that such excellence is not noticeable in later times is broadly justified.

Excellence of Gupta coinage

• Die-struck gold coins showed kings in vivid, individualised poses — Samudragupta as veena-player and performer of the Ashvamedha, rulers as archer, horseman and lion-slayer, and the Chandragupta I–Kumaradevi marriage type.
• Reverses carried finely modelled deities — Lakshmi on the lotus, Durga on the lion — alongside the Garuda standard.
• Legends were Sanskrit verses in poetic metre, fusing portraiture, religious iconography and literature into a single aesthetic object.

Why it was not matched later

• Decline began within the dynasty: gold content fell in the later issues of Skandagupta's era amid the Huna wars, and designs coarsened.
• The early medieval contraction of long-distance trade and monetisation — the paucity of coins emphasised by R. S. Sharma — removed the economic base for fine gold coinage.
• Early medieval issues became stereotyped and repetitive, such as the billon bull-and-horseman series, with no attempt at portraiture.
• Sultanate coinage, following the aniconic tradition, was purely calligraphic; Mughal mohurs achieved calligraphic refinement, but figural types like Jahangir's zodiac issues remained rare exceptions.

Artistic individuality, iconographic richness and metallic purity thus converged only under the Guptas; later coinages excelled at best in calligraphy, never again in figural numismatic art on that scale.