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Registered
Join Date: Jan 2003
Location: Burford, ON, Canada
Posts: 2,336
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There are un-numbered cases of all vintages including the aluminum cases.
There are two casting numbers, you've posted 102.3R, on the other side is 101.?R . You may also find some casting dates on both halves like 14/71 the location depends on the year I think. The numbers would help my research. The "R"'s are revisions and can indicate a date plus some internal characteristics.
I agree that an un-numbered case is the most likely possibility. If that is so, then you cannot be sure of what is inside without a teardown.
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Keeper of 356, 911, 912 & 914 databases; source for Kardex and CoA-type reports; email for info
Researching 356, 911, 912 & 914 Paint codes, Engine #'s and Transmission #'s
Addicted since 1975
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