Could this be Glenglo?
It did have some red streak in the flesh. The peach was underripe. Some flesh was pale yellow and firm. I could have wait a week for it to fully ripen. It may have more red then. Very juicy but still quite acidic.
I would like to hear from all of you what variety this peach is. The fruit hung under the tree’s canopy and mostly in shade. In addition, it was inside a paper bag for since it was a thumb size.