All have two different balance staffs

There's a lot of info contained in the * is pretty squirrely in terms of parts. All are 15 jewel movements. Here's the info for the 1948 material catalog:

No. 825* -- 15 Jewels
No. 826 -- 15 Jewels Straight escape wheel pivots.
No. 827 -- 15 Jewels

All have two different balance staffs with 0.40 and 0.55 hairspring shoulders.
• No. 825 has long and short fourth wheel pivots. All have 2 identically
shaped intermediate bridges and detects, only one is left and the other is
right of stem, also different center wheel, cannon pinion, hour wheel, third
wheel, sweep-second post, sweep-second wheel, tension spring and screw for
sweep-second mechanism