The most likely answer is that "US 1906" is what it is chambered in, meaning the US .30 of 1906, also known as the .30-06 Springfield.
The second one is shorter
If it is a ww2 mauser, the maker & the date made will be stamped on the top of the breech. it will look something like this bnz 43 for a mauser made in 1943 by maker bnz The caliber is 7.92 mm or sometimes referred to as 8mm mauser model 98 means it was made in 1898 and it shoots a 7.9mm or 8mm round i have one with the serial number 4101 also known as Gew 98
The Model 1903A3 rifle is base upon the Mauser 98 action but they are not exactly the same.
The Mauser Gewehr 98 was created and produced around World War I. Often times, people will say M98 to denote the Gewehr 98 or K98k. This is true because they are referring to the basic design. On the other hand, Mauser is currently producing some new, modern versions of the Mauser 98 action. This model is known as the Mauser M98. Hope this helps.
Your question is???
Mauser 98 from WW I.
You are describing what sound like a Mauser 98 rifle. The caliber can only be truly determined by having a gunsmith make a chamber casting. Most were in caiber 8mm Mauser, but there were different calibers, and at least 2 different bullet diameters. Have it checked by a competent smith. Serial number should be stamped on the receiver.
Mauser M 98
All mausers are different because of the different models that were made for different nations. The Mauser Model 98-29 was manufactured in Czechoslovakia for the Persian Army. Based upon their requests, the rifle is longer than most and would be about the length of a Gewehr 98 in World War I.
I don't believe so
Requires professional appraisal
Yep- there are airsoft versions of the Mauser 98K, licensed by Mauser- gas and spring versions. Google search for Mauser 98 airsoft. Hobbytron has a spring version for $119.