Frans,
I'm not sure what your problem is.
The BM may have multiple specimens of the same coin, each of which will have its own number. In that case you can cite either
a. all of the coins, e.g. "BM 136-140"
b. just the first, e.g. "BM 136"
c. the one that most closely matches yours in minor details such as
legend splits, e.g. "BM 138".
The
Catalogue also describes many
types and varieties that are known, but are not present in the BM
collection.
Sometimes these missing
types are given an entry in the text, with an asterisk, dagger, or paragraph sign instead of a
catalogue number. These you cite as e.g. "
BMC p. 125, *". You can add the source of the citation too, e.g. "(C. 321,
Paris)" or "(J.
Hirsch XXIV, 1909,
Consul Weber, lot 2563)".
Many
bust and
legend varieties are cited in footnotes, which you can cite as e.g. "BM 324 note", again adding the source in parentheses if you like.
Does that answer your question?
