As to how bunkering in the old days that had that stylistic "lacy" or "jaggedy" edge grass look at the grass sand lines one of the best to explain that was Richie Valentine.
I had that conversation with him once about the evolution of Merion East's bunkers that started out generic, then were grown into lacy and jaggedy edged bunkering and were maintained like that for some decades.
How did they maintain bunkers like that?
Well, one thing we do know is that through the teens, 20s, 30s, 40s and maybe even into the 50s or even the 60s they sure didn't do it with anything mechanized.
For the basic grass surrounds, and even some of the grass/sand lines they were cut by scythes. Think about it---there is no way you can maintain straight clean edged grass lines with a scythe.
Richie also said some of the guys on the crew were just real artists with a scythe. Today that art is a totally lost art.
Richie also said that all those guys were Italians, and they all just had that knack. Richie also said that one time at Merion William Flynn said to his father, Joe Valentine;
"Joe, there's no doubt about it---there's no one who can build and maintain bunkers like you EYEtalians.
You guys are talking about how incredible a guy like Jeff Bradley actually builds these bunkers and their rugged grass lines.
That's true.
Now just imagine a maintenance crew like Merion East's back in that day with about 10 or so Jeff Bradley's MAINTAINING those bunkers day in and day out the same way Jeff actually builds them.
Do that and you can understand that great old "lacy" or jaggedy edged bunker look in the East, the West or anywhere else.
Like Jeff Bradley today, back then it was all done by hand. Basically, there is no mechanized alternative to maintaining that "look" and I doubt there ever will be.