Note from Barry Murphy:  There isn't a complete list of the magistrate issues published anywhere.  The most often cited references are to BMC and Copenhagen.  BMC dates these issues to 228-164 BC, Copenhagen just says after 343 BC.  Your particular variety is not listed in either.  I did a quick check through some of the other standard references, McClean, Weber, Pozzi, Jameson, Delepierre and couldn't find it in any of those either.

Note from Curtis Clay:  We happen to have a coin of your magistrate in our photofile, TNA auction, Dec. 1983, lot 118.  They give two refs: Mionnet IV Suppl., p. 237, 5 and Glasgow, Hunter II, p. 153, 13, pl. XXXIX.11.  They give only a general date, c. 228-146 BC, and say "Very rare variant."

Side note:  In response to the question about a list of magistrates for this series, Barry Murphy is developing one, based on published works and auction catalogues.