I know of a pre 64 model 70 which had been owned by a pro buff shooter in the Territory and the rifle had endured a fairly hard life.
The scope mounts had been arc welded to the action and the weld was burned in deep with an undercut at the edges.
During a restoration the welds were removed and the action repaired using the technique I described in my earlier post.
When finished the only give away was a barely detectable slight difference in the colour of the blueing when closely examined in bright light.
The job was done by one of Australias top gunsmiths, a man who is very capable of quality work.