Hi Jim K
If I did not read wrong.
The # 22 (Visser) is engraved Mauser-Werke.
The # 29 (owner?) is engraved Waffenfabrik-Mauser.
Both dates from the years before 1922.
But you know the explanation of the alteration or anomaly?
As you know mine are continuous and have both odd and registration.
It would be another anomaly?