1891 India - British 2 Annas Mint?

Just picked one of these up today (https://en.numista.com/catalogue/pieces17535.html) and was wondering how to tell what mint (Bombay or Calcutta) the coin is from.  The page describes type 1/2, but not b/c/*.

Hi glorkar,

This is from "British Commonwealth Coins" by J.Remick, S.James, A.Dowle and P.Finn

With Bust A or B:
I) no mm (Calcutta or Bombay)
2) C incuse on shell on reverse near bottom of coin (Calcutta).
3) B incuse in flower on reverse near top of coin. B is upside-down on a few coins. (Bombay).
4) B raised in flower on reverse near top of coin. (Bombay).
5) Dot under date and just above shell. (Bombay).

This site is a great help to find out varieties on B.I. coins,
http://baldwin.co.uk/coins-of-india/VictoriaEmpress/CatVicEmpress_TwoAnnas1.htm