I've seen the 1 gramm bullion bars made from 21 different metals with a Buffalo on them. Are there any made with a Spider?
Here is a list of the 21 different metal 1 gramm bars I've found:
zirconium
silver
brass
bronze
nickel
nickel silver (contains no elemental silver)
molybdenum
stainless steel (next to impossible to find)
gold-plated silver
niobium
indium
zinc
iron
aluminum
columbium (same element as niobium)
lead
copper
German silver (an alloy containing no elemental silver)
Tibetan silver (an alloy containing no elemental silver)
titanium
tin