Reflex Sights - 1x24 Model

Amber,
Here is a link to a blog showing the location of the serial numbers based on year of manufacture:
http://remingtonsociety.com/forums/viewtopic.php?p=29989

Excerpt from the site:
175X Bottom -- 1905
743X Bottom -- 1905
7149X Bottom -- 1909
7521X Bottom -- 1909
10330X Bottom -- 1911
10660X Bottom -- 1911
15240X Bottom -- 1913
18593X Bottom -- 1915
19705X Bottom -- 1917 from James Tipton's list. He says 1917 goes to 204161. The factory ledger gives 199611 as the high number on Sept. 30, 1919?!?
28865X Side -- October 1924
33571X Side -- late June 1928
76033X Side -- After WW-II, probably 1947.

1 for turn off and 0 off turn on not need if you turn off your manual lock by going setting.

just use setting to change it, you will able to use 0 again.

try trijicon themselves. they are awesome at customer service...
they emailed me immediately when i sent a request to thier website

Give Sightmark a call they will provide you with a copy of the Instructions. 817-472-4357.
Dave Greig Opticsbestbuy.com