That's a Clark County, Washington plate, from about '63, I believe. Doesn't look like the photo was taken in Clark County though, judging from the dry-climate background.
"If those ***hole husbands of ours bring back ONE more bird for us to pluck, I'll be plucking something off of THEM!"
That’s **** Scritchfield on the left but I can’t ID the other guys. The car is the Sam Conrad roadster and it ran a Hugh Tucker built Olds, could one guy be Tucker?