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In these pictures you can see the cast frame of brass
which is not plated or painted, and does not have a bulge with a
well at the front of the key to hold the bottom of the spring.
The spring is held by a lip that is attached under the anvil,
is bent down toward the base, and then bent back to horizontal
to hold the spring. Other characteristics of this type vary
greatly from key to key. The key shown here has angled knurling
on the lock nuts, and unusual rear binding posts. (The eye screw
is missing from this key.) |
(click to enlarge) |
(click to enlarge) |
(click to enlarge) |
(click to enlarge) |
Notice the binding posts on these two brass frame keys.
My theory is that these binding posts are stock items from
some other electrical device or older type of key. |
(click to enlarge) |
These pictures show the base of two rare variations of the Brass Frame
type, with the words "Type J-38" (left) and "Key.Type J-38 (right) on the front
of the base under the operating knob. |
(click to enlarge) |
(click to enlarge) |
This same "Type J-38" key (above left) also has "USSC" cast into the back of the frame.
(The circuit closing switch and eye screw are missing on this key.) |
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