Watch List notes:

Commonwealth (1649-60), pattern Sixpence, 2.77g, 1651, 22.3mm., m.m. sun, by Blondeau, shield of England within palm and laurel wreath, rev. coin alignment, conjoined shields of England and Ireland, mark of value above, edge smooth (ESC 218 {1498A} [R6]; N.-; S.-), fine, extremely rare.
Provenance:
D S Freedman, Spink auction 55, 8 October 1986, lot 90

The current ESC states: "thinner flan, plain edge (Not traced)"
Estimate: £1,500.00 - £2,000.00