Guatemala- Color Variation Or ??

Are these color variations of Guatemala Scott#118 (no mention in my Scott Classic Catalog) or am I missing something?

Thanks!

Chris - SG lists (numbers may have moved) 120 - blue and orange - and 120a - blue and orange-yellow, which would fit. The third stamp is oxidised, I think.

I'd second that opinion.

I was just commenting to my wife how amazing it is to have a question like this, post it to this forum, and in under 30 min have "stamp friends" from around the world provide answers

Thanks so much Geoff and Rod. Good to know about the color variation for the first two. I was thinking along the same lines of oxidation for the third as well. Good to have it confirmed.

I find that I'm constantly handicapped by using only a Scott catalog

And your wife said, "It's amazing how many odd people there are with time on their hands" ...

My (incomplete) page from the period - yours are much nicer than mine!

You can remove the oxidation and return the original color.

https://goscf.com/t/40403&SearchTerms=oxidation

Chris, you have 2 (if not 3) different perforation rates on your 3 stamps.