Unknown logo on a Mauser M1871

[Haibin]

Would like to know the meaning of this logo or a trade mark. It appears on the receiver of a Mauser M1871 but obviously the Mauser bolthead was inserted later. I am new here so my apology if this is not a proper site to post it.

[Oregon Bill]

Can't quite make it out, but congratulations on owning a Mauser 71.