Images below show all numbers that are matching, not shown is the magazine follower, but this does have the matching number
1937 Mauser Portuguese Model 937-A Service Rifle. This rifle is nearly identical to the German Army Issue K98k Rifle with the exception of the front sight protector and an extra set of sling attachments.
The large fixed front sight protector is the giveaway that this is a Portuguese Mauser.
These rifles are German Waffenamt marked and largely identical to a standard pre-war K98k.
Portugual began replacing the 1904 Mauser - Vergueiro
rifle, first with the German 1933 Standard German Model, then with the
German 1937 (937-A Short Rifle)