1942/1 Not Sure?

I don't think it is. It doesn't look like the picture in the Red Book. It looks like the 1942-D had a similar, but less prominent variety.

It is actually a machine ( strike) doubling, and no hub doubling in the making of the working ( striking die). Type I doubled die is hub doubling, such as in the 1955/55. Machine Doubling occurs because of movement of the working die as the striking has completed, and is not considered to be a mint error or a variety. Seen as a flattened shelf like outline, with no doubling of the serif or device. Spadone did make some identifications as varieties and doubled dies, which really weren't, and Machine Doubling was often identified as true doubling.

Also although the term "overdate" is often used in referring to the 1942/1 Mercuries, 1914/3 Buffalo and others, they are actually Type III doubled dies where 2 different design hubbings were used to make the working die. Thus the working die was first hubbed one year hub and then after annealing was hubbed by mistake with the second year. This also happened on the 1960 DDO D/D Lincoln that was hubbed with one time a small date and the other time with the large date design. Overdates did occur in the far past when the dates were handpunched.

Jim

Thanks all!
It's to be a on going learning experience.