Need help with two guns

[Douglas711]

Ok I have found for sale two guns one is a

1939 S/42 all match but mag

other is a

1939/42 all match and mag

Both are for sale for $1195

Is the S/42 for 1939 a rare variation. The only thing I can find that might make it rare is according to The Gun Blue Book they stopped making them in april of 1939.

Any help here guys

Thanks,

Doug