CD 566.5: Poland
2 1/2" X 3 1/4" (64mm X 83mm)
(front skirt) J.STOLLE,,NIEMEN"
Picture courtesy Bob Berry
This insulator was initially published as a CD 565.1 but got grouped in with the very commonly found variants now generally recognized as CD 565.1 (both Polish & Russian versions). Technically this was the original assignment, but the others have been very established in the hobby so this one has been moved to CD 566.5.
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