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"Bö" indicates the barrel was made from Böhler steel. WaA 63 was the head Waffenamt inspector at Mauser in that period; he left in 1939 and 655 took over. The inspection team would have inspected every part of every rifle. (In theory; in fact, Mauser employees would have checked the parts and marked them and the army team would have spot checked. Later, when factories used slave labor, army inspections became more rigid.)
The "k" is probably a Mauser inspection mark.
Jim
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