Generally speaking, there are a ton of Mauser actions made by a myriad of manufacturers, yes there should be a banner on the top of the front bridge that will give you clues as to who made the action and for what country. That is unless it was ground off by bubba which is a distinct possibility too. I've come across smiths who flat out won't work on any Mauser except FNs because there are so many out there and so many different makers that it can be near impossible to know the metallurgy and quality of a given action, just too much liability.