I don't really know what it is, but its old

[MFC]

Originally Posted by firefree

Where is the chamber date located? In my short research I read all do not have them If its the number next to the DWM, its "03." Does not show in the pictures

The date was located above the chamber. Only 1908 military 'first issues' were not dated (1908 or 1909) but they did not have a stock lug as yours does. The stock lug was introduced on PO8's in 1914. As Alanint (Doug) stated, there was a date on it which was removed.
'03' are the last two digits of the serial number. If the gun is all matching, '03' should be located on many various parts.