Black and chrome, it practically screams Art Deco. This Sheaffer dual pen desk set is definitely from the Art Deco era. My expert tells me that this is a a model P074 base from 1936 and originally sold for $12.50 with two pens with number 3 series nibs.
The sockets are second generation Dry-Proof sockets. The enlarged top part of the socket can be turned to lock the pen into the socket, presumably keeping it from drying out between uses. Again according to my expert, this system did not succeed in keeping the pens wet, but it did not break as easily as the first generation. One of these sockets still turns to lock in the pen, while the other has been broken and glued together.
In the pictures below, you can see that the lip of the section has a slight taper which was designed to mate with a tapered inner surface inside the socket, sealing the nib from the air. Earlier Sheaffer desk pens have a flat face on the section.
The pens are correct for this base, one with a number 3 nib and the other with a number 33. These are base model pens; the 3 series nibs were the smallest Sheaffer made. The 5 series was mid-sized and the Lifetime nibs were the largest. One of the pens, like its socket, is not in great shape. The fill lever is missing and someone has used pliers on the section, leaving some ugly dents there. I’ll be looking for suitable replacement parts.