There are a few 50 peso verities. Anything close to or below spot that looks nice. Apmex usually has some listed, not sure if you can still get ebay bucks back on those. I picked up a low mintage 1943 last year when I randomly searched for a gold 50 peso.
Once upon time there was love for them and Hungarian Koronas. Sometimes even from folks who (gasp) doubted the unicorns forever script.
Mexican gold is some of my favorite. Especially the Aztec calendar. Just be cautious, because you'll have to sell a little under spot if you're going to a dealer.
I’ve found and you can look up tons of videos on YouTube, that you will get the most for AGE’s. You should get spot for 1oz Eagles and the dealers around here even give a little premium for the fractional. YMMV
You should get over spot for eagles and maples. You should get under spot circulated world gold. You'll get all over the place for pre33 gold.
Should is the key word here, allot of dealers want to maximize profits and pay a tad below and then sale it for a tad above, kind of a double Did situation...LOL