I am writing to all fellow purists for some friendly advice for a friend. This friend loves collecting Patek watches and has asked my advice for his next purchase. His only rules are it must be a white metal and it must be Patek. I have included his current collection and if you can reply with what reference should be next and why.
Current Collection
5146P - 5135P - 5140G - 5130P - 5101P - 5102G - ?
Humbly
David S-W