I have quite an extensive collection...now u know why I need your help!

[LAscorpion]

This looks super old hope it can be ID'd

[Jerry B]

May day 1938 also known as tag der arbeit or workers day.

[Adrian]

These type of badges are collectively known as tinnies. They were sold to raise funds for the government and good causes. There is a great thread about them here.

[LAscorpion]

Thank you Adrian! Once again the moderators on this website are a wealth of information!