Luger year by serial?

[kurusu]

Originally Posted by Norme

Hi Tom,
One can narrow down the year of manufacture of an Imperial Luger by answering these 3 questions:
Does it have a hold-open?
Does it have a stock lug?
Does it have a relieved sear?
Regards, Norm

Just to mudd things up a bit.

Most that didn't have originaly the hold-open had it added. But it can be spotted that it was done.

Some sears had the relief cut later on in the field. It can be spotted too.

Edit. And we can rule out before 1910. Chambers weren't dated until then.