The only variety I see in my books is the D over sideways D, we would need to see a pic to know for sure but British collectors do not seem to get too excited over a repunched date numeral unless it is pretty dramatic.
I don't collect Farthings and know little of them, but this is what I found:
Known Die Combinations: Obverse Reverse Ref No: Peck No: Comments 2. B. CG1851-VA-2-B. 1572 Normal 2. Ba CG1851-VA-2-Ba. 1572. Stop after BRITANNIAR 2a. B. CG1851-VA-2a-B. 1573. Wide date 2a. Bb. CG1851-VA-2a-Bb. 1572. Wide date, no serifs to B 2b. B. CG1851-VA-2b-B. 1572. D over sideways D in DEI 2b. Bb. CG1851-VA-2b-Bb. 1572. D over sideways D in DEI, no serifs to B 2c. B. CG1851-VA-2c-B. 1572. Roman 1 in Date 2d. B. CG1851-VA-2d-B. 1572. Narrow date 2e. Bb. CG1851-VA-2e-Bb. 1572. Die Fault 18:51
Comments
World Collection
British Collection
German States Collection
Known Die Combinations:
Obverse Reverse Ref No: Peck No: Comments
2. B. CG1851-VA-2-B. 1572 Normal
2. Ba CG1851-VA-2-Ba. 1572. Stop after BRITANNIAR
2a. B. CG1851-VA-2a-B. 1573. Wide date
2a. Bb. CG1851-VA-2a-Bb. 1572. Wide date, no serifs to B
2b. B. CG1851-VA-2b-B. 1572. D over sideways D in DEI
2b. Bb. CG1851-VA-2b-Bb. 1572. D over sideways D in DEI, no serifs to B
2c. B. CG1851-VA-2c-B. 1572. Roman 1 in Date
2d. B. CG1851-VA-2d-B. 1572. Narrow date
2e. Bb. CG1851-VA-2e-Bb. 1572. Die Fault 18:51