The template to this helmet can be found in the so called "maciejowski bible".
This museum quality -3mm strong- Helmet is an authentic recreation, was done in month long painstaking work by a real blacksmith by hand and is my own property.
Wikipedia says:
... also called the Crusader Bible or Maciejowski Bible, is a medieval picture Bible of 46 folios. The book consists of paintings of events from Hebrew scripture, set in the scenery and customs of thirteenth-century France, depicted from a Christian perspective. Scenes are surrounded by text in three scripts and five languages: Latin, Persian, Arabic, Judeo-Persian, and Hebrew.
Forty three folios are kept in the Pierpont Morgan Library. Two folios are kept in the Bibliothèque nationale de France. A single folio is kept in the J. Paul Getty Museum, Los Angeles.