What's the difference between the ETA 2836-2 and 2824-2?
The ETA 2824-2 and the 2836-2 do not use the same mainplate, the addition of the day function adds 0.4mm to the thickness, all of it between the stem and the front of the movement.
The 2834-2 is nothing more than a 2836-2 mounted in a plastic spacer to increase the diameter of the movement, and a new day wheel for the display at 12.
Other members of the 2800 family, most are obsolete:
2800 - 21,600 bph manual, 11.5 l
2801 - 28,800 bph manual, 11.5 l (w/ or w/o hack)
2802 - 21,600 bph manual, date, 11.5 l
2803 - 21,600 bph manual, date, 13l
2804 - 28,800 bph manual, date, 11.5 l (w/ or w/o hack)
2805 - 28,800 bph manual, date, 13 l (w/ or w/o hack)
2806 - 36,000 bph manual, date, 11.5 l (w/ or w/o hack)
2807 - 36,000 bph manual, date, 13 l (w/ or w/o hack)
2809 - 21,600 bph manual, day-date, day-date, 13 l (w/ or w/o hack)
2810 - 28,800 bph manual, day-date, 11.5 l (w/ or w/o hack)
2811 - 28,800 bph manual, day-date, 13 l (w/ or w/o hack)
2812 - 36,000 bph manual, day-date, 11.5 l (w/ or w/o hack)
2813 - 36,000 bph manual, day-date, 13 l (w/ or w/o hack)
2816 - 28,800 bph manual, day-date, 11.5 l (w/ hack)
2817 - 36,000 bph manual, day-date, 11.5 l (w/ hack)
2819 - 36,000 bph manual, 11.5 l (w/ hack)
1820 - 21,600 bph auto, 11.5 l (w/ or w/o hack)
2821 - 28,800 bph auto, 11.5 l (w/ or w/o hack)
2822 - 21,600 bph auto, date, 11.5 l (w/ or w/o hack)
2823 - 21,600 bph auto, date, 13 l (w/ or w/o hack)
2824 - 28,800 bph auto, date, 11.5 l (w/ hack)
2825 - 28,800 bph auto, date, 13 l (w/ hack)
2826 - 36,000 bph auto, date, 11.5 l (w/ hack)
2826-2 - 28,800 bph auto, BIG date, 11.5 l (w/ hack)
2827 - 36,000 bph auto, date, 13 l (w/ hack)
2828 - 21,600 bph auto, day-date, 11.5 l (w/ or w/o hack)
2829 - 21,600 bph auto, day-date, 13 l (w/ or w/o hack)
2830 - 28,600 bph auto, day-date, 11.5 l (w/ hack)
2831 - 28,600 bph auto, day-date, 13 l (w/ hack)
2832 - 36,000 bph auto, day-date, 11.5 l (w/ hack)
2833 - 36,000 bph auto, day-date, 13 l (w/ hack)
2834 - 28,600 bph auto, day-date (day at 12), 11.5 l (w/ hack)
2836 - 28,600 bph auto, day-date, 11.5 l (w/ hack)
2837 - 36,000 bph auto, day-date, 11.5 l (w/ hack)
2838 - 36,000 bph auto, day-date, 13 l (w/ hack)
2839 - 36,000 bph auto, day-date, 11.5 l (w/ hack)
2842 - 21,600 bph auto, date, 11.5 l
2846 - 21,600 bph auto, day-date, 11.5 l
Technically these twelve movements should be classed as their own family, as the layout is altered, but as they can use many of the gears from the 2800 series, we include them
2850 - 28,800 bph manual, 11.5 l
2851 - 21,600 bph manual, 11.5 l
2852 - 28,800 bph manual, date, 11.5 l
2853 - 21,600 bph manual, date, 11.5 l
2858 - 28,800 bph manual, day-date, 11.5 l
2859 - 21,600 bph manual, day-date, 11.5 l
2870 - 28,800 bph auto, 11.5 l
2871 - 21,600 bph auto, 11.5 l
2872 - 28,800 bph auto, date, 11.5 l
2871 - 21,600 bph auto, date, 11.5 l
2878 - 28,800 bph auto, day-date, 11.5 l
2879 - 21,600 bph auto, day-date, 11.5 l
Then there is the completely different 2890 family:
2890 - 28,800 bph auto, 11.5 l
2891 - 28,800 bph auto, 11.5 l various display versions of perpetual calendar,
2892 - 28,800 bph auto, date, 11.5 l
2893 - 28,800 bph auto, 11.5 l with 24 hour display (-1, timezone display; -2, 24 hour hand; -3, timezone display)
2894 - 28,800 bph auto, date, 12.5 l with chronograph module
2895 - 28,800 bph auto, date, 11.5 l small second hand at 6
2896 - 28,800 bph auto, 11.5 l, with big date
2897 - 28,800 bph auto, date, 11.5 l, with power reserve display at 7»