David:
My wife, Monica, owns a '69 912. She paid a good price (comparatively speaking) for the car, and paid out the

for an engine and tranny rebuild on the car. She was horrified at the total cost, especially for parts, when the car was finished.
Now, with much relief, she's seeing the value of her car going up as the world becomes more interested in these hard-to-find, and now considered rare, Porsches. Recently, Pano had an article on the climbing price of 912's. (Phew!)
The '69 912 is unique in many ways: engine parts, body and wheel-base length, etc., all making them just a touch different and unique from the '68 and earlier 912's.
If this car you speak of is, in fact, as pristine and original as you indicate, it might be worth something ..... uhm..... I'm guessing here ..... in the low to mid 20K's in the "Ooh-La-La" Car sales places - and roughly in the high teens (Thousands - I say thousands, that is) on the Porsche-phile circuit. Now, if you're good at selling refrigerators to Inuits, and water to a fish, you might get more. This is just my guess.
Anyway, Monica and I are always looking at the current cost of 912's, particularly '69 912's, so as to get an idea of her investment in hers.
Just my 0.000000002 cents worth.
Dan'o