I think this is a really difficult proposition. Many of the bronze proof farthings of the Victorian Bunhead series that I have seen, I can not convince myself are actually proofs. They appear to be specimen like and were obviously produced with special attention, but do not compare to the known proofs from the years sets were issued. Therein lies the problem, I would say they are a specimen coin whilst others may say they are proofs....some circulation coins also have been struck from what appear to be specially prepared dies, or are early strikes so they present with a clean strike and mirrorlikek fields. The 1895 veiled head farthing is a good example, they can also be found with a cameo effect and proof like fields, yet are certainly circulation strikes, but from what were a new set of dies for a new design.