Hi Edward,
I am sure this is Andrea Miniatures 90mm Templar figure S8 F01 with a replacement head.or even a cross between S8F01 and S8 F16 (kit bashing) These are old kits but very good, and Mike Blank used S8 F01 in the 90s to create his Sword and Lance Best of Show winner at the time,there was an article in Military Modelling about how he painted it (in Black) it was quite superb.
Regards
Pete