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scott brockelmanas andy stated i do have a delehanty with the overprint back, not the 150 series back. i now anyone that i have spoken with who collects this issue has ever seen a Type 2 with a printed back. the overprint that i have is also the only Type 2 known to exist with the overprint. the origin of such we may never know.
the overprints are much scarcer than the 150 or blank backs, possibly 10-1.
scott