We bought this original binder for a 904 locally in Riverside CA. From the hand penciled notes it appears to be from car 011 or 013. There is a note " remember Riverside ? ".
Only a few 904's ever raced at Riverside. Other notes are regarding specs like oil change and type, point setting, etc. that makes it look like this was the owners book for his original car. Normally only this document would be in this binder. The binder also has the engine assemble guide for the four cam engine which were used in the early 904 cars.
The listing is on ebay but we will entertain reasonable offers.

https://www.ebay.com/itm/1963-Porsch...Asz~:rk:2:pf:0

Up for sale is an original Porsche Carrera GTS/904 drivers manual and Carrera engine guide for 1500 GS, 1600 GS, and 2000 GS engines. The manual appears to have been from an early 904 possible 11, 12, or 13 based on a note that it raced at Riverside International Raceway. I was able to find race result information for 1964 and only found the 3 serial numbers raced for that year. The Carrera Guide for Engines type 1500 GS/1600 GS/2000 GS is edition June 1963, print number W 399E in English, the Porsche Carrera GTS 904 Driver’s Manual is from December 1963, print number W 311E, English text, all in all 244 pages, this version with the binder with insert is extremely rare.