As stated by Louis, the standard sight for the M1910 was typical of the 'pre war' models of M1903, M1905, M1908, M1910. The front is a tapered bead dovetailed into a ramp, the rear is a folding leaf with one standing, one folding. My M1910 takedown model has the 'wide notch' version (see parts 6a and 7a below) and is marked '300'.

There was an optional 'British style' three leaf folding sight available (standard on the later 'High Velocity' offerings).

Images from 1939 Stoeger catalog:

Details from 'Original Mannlicher Schönauer Rifle Parts', '39 Stoeger:

Ebay listings for originals - very pricey, but good images:
Ebay

Ebay

Ebay

Here are new made MS parts from Deutschland:
Mannlich-Schönauer

In this image from Louis' post, one can see the 'wide notch' sight above (on takedown model) and the standard below (on stutzen):

Front sight, typical:

Note that the sight pictured is 'rebated', or set back about one inch from the muzzle. Some are, some aren't. The sight on my M1910 TD is not.

From 1935 Steyr catalog:

Here is an M1910 with 'British Style', or 'express' sights;