Here are two pieces related to "Bloody Mary" from her short reign:
AR Groat, 24 mm, 1.81 g, 3h
London, CE 1553-1554
SCBC 2492
N. 1960
Pomegranate privy mark
O: MARIA D G ANG FRA Z HIB REGINA crowned bust left
R: VERITAS TEMPORIS FILIA long cross fourchee over royal shield
AR cut Groat, 22 x 12mm, 0.87g, 9h, London ,
CE 1554-1558
SCBC 2508
N. 1973
Lis privy mark
O: PHILIP Z [MARIA D G REX ET R]EGI crowned bust of Mary left
R: POSVI[MVS DEVM ADIV]TO NOS cross fourchee over royal shield
from the patina it appears that this piece was cut at sometime in the past. It would be interesting to hear from anyone who has encountered similar cut groats, particularly from a time when half groats were being minted (though considering their respective catalogue prices, there may have been a shortage of half groats that caused groats to be cut for smaller change.)