Advice on Pin Trading & what to look for

[nannygee12]

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Hello, 

I used to pin trade when I was younger and I’d like to get back into it. I don’t remember what kind of pins you should trade for, can someone please give me some advice. 
I have pins that are marked “Cast Lanyard Series” and believe those are harder to find. Are the Hidden Mickey Pins valuable? Are those the best pins to trade for? 
Please let me know, thank you!