Hi Frank,
They look like Calcutta to me. John Hunt used 'JH' and an anchor, I believe there was also a J. Hicks who used similar marking, both worked out of Calcutta.
Hopefully someone will have a copy of one of Wynyard Wilkinson's books on the subject to confirm/deny.
Here is a link to John Hunt's mark:
http://www.925-1000.com/ix_HuntJ.html" onclick="window.open(this.href);return false; but I suspect from from what I can remember of Hick's mark that he (Hicks) is the maker.
Regards Trev.