What?!

Sometimes I have stamps arrive in the mail that I have no idea why or when I purchased them (fortunately not TOO often) ... anyway this set of Mexican Airmail stamps arrived yesterday. I can't remember why I bought them. The Ebay invoice is in my email and on the my list but ... ??

I often buy sets to obtain one or two topical stamps, but there's nothing topical here that I collect. I do like the Dr. Atl stamp ... very attractive; and one might think that the educator stamp would be something I'd collect, but I don't. Anyhow they will fill six spaces in my new Mexican Airmail collection.