Hi Doug,
The 1939/42 with 655 acceptance proofs is a fairly hard variation to find. If I remember correctly, the "W" block was the transition block from the E/63 to the E/655 with a very few examples have one of each. Since it is in the transition block and does have the 655 acceptance marks I would say that the E/63 is correct on this gun only because of the transition. Normally the base has the same proofs as the acceptance marks on the right receiver. Hope this helps you some -- Bill Munis
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