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Is it from an early 912 or the 912E (one yr only, using a version of the 915 box).
The early 912 will have a "901" type box but the ratios may be different. To check the spec you need the code underneeth the bellhousing (on the rib). It will be something like 902/01 and it is pretty much the same as the early 911 box (pre-1970-ish).
Values? They don't seem to be worth that much...... until you try to buy one. Same with the 914 box (very similar). The problem is the parts inside are extremely expensive to replace so a rebuilt box (with evidence) can be very expensive but unknown (usually needing a rebuild, unless you are very lucky) boxes shouldn't be anything like as much.
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