The trigger appears to be at least pre 1910 or so, by the lack of any inertia blocking device*...am I correct that there is no floating weight of any sort?
Also, the color changes that indicate that the sear levers were heated before being bent, is not an indicator of an aftermarket or factory trigger. It only means that double trigger sears were modified to meet ther single trigger's bearing surfaces, as with every Western/Lefever Nitro single trigger. I say this in advance to keep the discussion on track. Otherwise it won't be long until a devil's advocate comes along and sites those colors as evidence that it's an aftermarket trigger...when in fact it both factory and aftermarket can show evidence of sear lever modifications.
* not to be confused with an inertia shifting device, this gun appears to be neither...
