1.
PAN-00064870 - military button, Dutch 19th-20th century: Navy (anchor on dotted background)
2.
3.
PAN-00075771 - military button, Dutch 19th-20th century: Engineers (helmet on dotted background)
PAN-00080107 - military uniform button, Second World War (non-Dutch)
PAN-00078975 - military button, Dutch, post-Napoleonic