David Stamm.....
If Im not mistaken the first picture of the 6th at Riviera is obviously after it was open for play. The second and older picture is right after Billy Bell constructed the green and bunkers and George Thomas just approved it for seeding.
I was thinking the same thing. If you look closely, the green bunker doesn't look to be finished and the back bunker looks as though it might not even be roughed in, though the space is there, but the nose isn't.
It is really cool that the guy is standing on the tongue - it gives some perspective as to the size of the bunker - which looks to be surprisingly huge!
I know you California types dig all the lacey edge nonsense, but I think the original (unfinished?) look is better looking because it fits in better.
Ciao