Islamic Timurid Shak Rukh Coins Identification

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I wish I could help, but I know next to nothing about Islamic coins.

Because the Islamic year is shorter than the Christian year, the dates are not simply additive. AH 828 correlates more or less to AD 1425, which is well within Shahrukh's reign.

Timurid coins have become much more common in the West since the fall of Communism in central Asia, and the arrival of large numbers of Westerners in the area thanks to the Afghanistan War. The zeno.ru website currently lists 718 coins of Shahrukh; here are their listings for the various classes and subclasses of silver tankas dating from 827 to 852 issued in the name of Shahrukh. As you can see, there's a large number of types.

The top coin appears to be Type A6, "four knots on obverse", and also dated 828. Much like this one. This type is only recorded from the Samarkand mint.

The middle coin looks more like Type A1; example.

The third coin I can't see a date on, but appears to be less "ornate" than the other two; the script does not have the distinctive "serifs" the other two coins have. Perhaps it is simply a later version of Type A1.