| Primary Embossing | Firing Rest | Marking Type | Dome | Crown | Skirt | Color | Notes | Ref. # |
|---|---|---|---|---|---|---|---|---|
| Westinghouse | Skirt | U-G |
|
|
W(encircled and sideways) | black-caramel |
radio treatment on top to the bottom of wire groove and marking is outlined and unlisted |
|
| Westinghouse | Skirt | U-G |
|
|
W(encircled) | black-brown |
radio treatment on top to the bottom of wire groove |
|
| Westinghouse | Skirt | INC | W(encircled) |
|
|
white |
|
|