Aluminum alloy Grains, Which alloy is it?

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The discussion revolves around identifying a specific type of aluminum based on its microstructure after grinding and polishing with aluminum oxide. The user suspects it may be a 2xxx series aluminum, likely cold worked through extrusion or cold rolling. They provide grain size measurements according to ASTM E-112, with values of 2.37, 3.1695, and 5.25 for different images taken at specific magnifications. The user seeks assistance in confirming the aluminum type and understanding the implications of the observed grain sizes.
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Hey guys

I need a little help trying to identify or getting a good conclusion of what kind of aluminum I have here. These aluminum was grind and finally polished with aluminum oxide of 3 microns. After the etching of the alloy with Keller's Reagent for a couple of seconds we took the following photos at a 11.88 amplification (.66 of the lens and 18 of the camera).

I think is a 2xxx aluminum, (comparison made with other micro-photos), cold worked (extrusion or cold rolling).

The grain size (according to the ASTM E-112) for the 66x18,2,,1.JPG image is 2.37, for the 1x18,3,2.JPG 3.1695 and for the ,66x18x4.JPG 5.25

Any help?

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