On the big group photo, I would guess late 20's / early 30's when the SA were organized enough to have uniforms, but not 100% standardized.

- As noted, no daggers

- Some guys are wearing puttees, not boots.

- Rank badges vary in size and color

- Uniforms vary in color and the ties are not all the same

- The Kepis do not seem to vary by rank. No sleeve ranks.

I have an album of over 100 pictures of a Sturm in 1934/5 and by that time they had daggers, and standardized uniforms.