Through your collecting experience, what pattern of these badges would you say are harder to find, the first or second type?

I am going to go take a look at one on Friday, so I have spent the past couple of hours researching them. If I remember correctly, he said it was a second type, and a Schwerin in zinc. From what I have researched, all second pattern badges were made in zinc. Is this true?

Also, are there any particular odd variants that I should be on the lookout for?

Thanks,
Mo