Yes, as Rob says about the issue date. All pyx listed as follows:
Lis 7 Jul 1625-29 Jun 1626
Cross Calv 29 Jun 1626-27 Apr 1627
Negro Head 29 Jun 1626-27 Apr 1627
Castle 27 Apr 1627- 3 Jul 1628
Anchor 3 Jul 1628-26 Jun 1629
Heart 26 Jun 1629-23 Jun 1630
Plumes 23 Jun 1630-30 Jun 1631
Rose 30 Jun 1631-21 Jun 1632
Harp 21 Jun 1632-11 Jul 1633
Portcullis 11 Jul 1633-27 Jun 1634
Bell 27 Jun 1634-18 Jun 1635
Crown 18 Jun 1635-14 Feb 1636
Tun 14 Feb 1636- 8 May 1638
Anchor 8 May 1638- 4 Jul 1639
Triangle 4 Jul 1639-26 Jun 1640
Star 26 Jun 1640-15 Jul 1641
Tri in circ 15 Jul 1641-28 May 1643
(P) 29 May 1643-15 Jul 1644
(R) 15 Jul 1644-12 May 1645
Eye 12 May 1645-10 Nov 1645
Sun 10 Nov 1645-15 Feb 1647
Sceptre 15 Feb 1647- mid 1649
Charles I is both a good reign to start with (in terms of volume of output and variation of designs and denominations) and challenging (like all hammered coinage, finding a decent strike on a nice round flan, with little wear when, by their very nature hand struck coins were of variable quality; the sheer number of different designs (including some real rarities) if you want a comprehensive collection ...)
However Michael Sharp's article Rob mentions is a very good start. You can read it here as a pdf: BNJ 1977 Sharp Article. The scanned plates aren't brilliant but will give you an idea. The (Sharp) group F coins are illustrated in Plate VII, nos 44- My example is #52
And... welcome to the dark hammered side!