we may have something like that. For now, nothing comes close. We're a much smaller community of enthusiasts, but growing and slowly sorting out the mysteries of the early Primero as we go. Know, though, that David's watch has resulted in dropped jaws in the Primero parallel universe as well. There were only 1000 of these watches produced in 1971, and an NOS is darned rare. That angular case is so easy to screw up through overpolishing, so it is especially pleasing to see one with razor sharp edges and an unblemished finish.

For your interest, these specific posts on WUS may be useful.
http://forums.watchuseek.com/f27/preliminary-notes-collecting-early-el-primeros-general-remarks-431440.html
http://forums.watchuseek.com/f27/preliminary-notes-collecting-early-el-primeros-specific-models-431451.html

There are several steel references as well as all the gold references missing, so regard it is a work in progress. I'm glad you have an interest...