Using a well-known moulding material used by dentists to form impressions of teeth a negative is taken and a plaster cast is created with all the exact detail. For the plaster products these are then dried and finished to requirements.
For the bronze, silver and glass pieces a silicone mould is made and a wax cast created which is then sent to the respective foundries. It goes through a 300 year old process called “Lost Wax Casting” and your piece is created from this.
The 3D miniatures are cast in silver or gold using a similar process but also incorporate 3D printing.