Yes similar to lot 16 http://www.colincooke.com/collections/james_workman_pt1.html
Quoting CC "BMC --. F--. Satin --. Similar to Gouby T but with re entered colon dots of which are smaller and much closer together, similar to those used on halfpennies. Unrecorded in any catalogues. Excessively rare, possibly unique."
Since the sale has this become a recognised variety? Interesting halfpenny colon dots. Perhaps the colon dots were re-entered after all but accidentally used a halfpenny colon instead.