I'm Not Even Sure Where To Start

Hi all,

I'm migrating today from my usual hangout (modern US) because of a mystery gift. One of my coworkers left a small baggie in my nametag when I got to work yesterday, and it's full of obsolete currency: pesetas from the 1960s, old Mexican pesos (the big ones from the 1960s and 1970s, not the new two-tone coins), some kind of commemorative Filipino coin (the back says "1949-1981"), and, erm, I'm actually not sure what this last one is, it says Estados Unidos Mexicanos on the back but the front is marked $1. It's from 1985, which I'm pretty sure is before the currency change, but it bears no resemblance to the one-peso coin from 1971 (although I think the same person is on both--there's no name on the older coin, but the profiles look like the same face).


Usually when I get world coins, they're newer (most of the stuff that mistakenly makes its way to my cash drawer is from the 1990s or later; I have a few Canadian cents from the 1940s and 1950s and a single French franc, but those are serious exceptions), and I just throw them in a Ziploc bag. I have no idea how to even begin researching these. I know what countries they're from, but where do you start with obsolete currency?