Welcome Al,
You are correct with the info that the S/42 code ended in 1939 so the receiver and toggle group are not from the same gun. 1940 lugers did not have the strawed small parts so yours have been either restrawed or are from different guns. The magazine is from a G date (1935) gun. I cannot make out the suffix on the front of the gun but it does not appear to be a "d" like the mag.
I would consider the value of the gun in the shooter range $700-900.
Tom
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