Sap, I completely agree with your observation. Some of the later designs are so abstract that it is not uncommon to "miss" the bull and the horseman altogether! On a number of instances, the bull just "jumped out" at me during a casual inspection and left me wondering how I had missed it earlier. The later coins clearly show a reduction in the percentage of silver. Here is a later coin of the same type:
Delhi Rajas, Madana Pala Deva (1145-67 AD), billon Jital
Obverse Bull to left. legend above:( Madava /) Sri Samanta (Deva)

Reverse Horseman to right: (Sri) Ma / d( ANA Pala Deva)

An expert recommended the following book on these, but so far I have been unable to find a copy:
Robert and Monica Tye: Jitals; a catalogue and account of the coin denomination and daily use in Medieval Afghanistan and North West India, Isle of South Uist 1995
Delhi Rajas, Madana Pala Deva (1145-67 AD), billon Jital
Obverse Bull to left. legend above:( Madava /) Sri Samanta (Deva)

Reverse Horseman to right: (Sri) Ma / d( ANA Pala Deva)

An expert recommended the following book on these, but so far I have been unable to find a copy:
Robert and Monica Tye: Jitals; a catalogue and account of the coin denomination and daily use in Medieval Afghanistan and North West India, Isle of South Uist 1995






















