Gold Double-crown, Tower Mint, London, struck under Richard Cromwell, 1658-1659. 27 mm, 4.43 g.

Obv: COMMONWEALTH OF ENGLAND around a shield bearing the cross of St. George; around, (mm. anchor) within a wreath of palm and laurel.
Rev: GOD WITH VS 1660, two conjoined shields, the one on the left 
bearing the cross of St. George and on the right, the Irish 
harp; X above (= ten shillings).

The anchor mint mark on this coin indicates that it was struck 
under the protectorship of Richard Cromwell, brother and 
sucessor of Oliver.

cf Seaby 3210 (mintmark); North 2718.