Bill
I'd be interested to know who added the 11th and 12th, and when.
Strong's original 11th was a relatively long par-4, that played from the current tee to a green not far from the current 15th green. The par-3 12th I suspect was a pretty controversial hole. It looks like it was about 220 to 230 yards up to an elevated green. The tee was over by the 16th tee and the green was in the same basic location as the current 12th green, in fact it may be the same green, although if it was Biarritz, maybe not.
There was a large long bunker right front of the green which had an interesting shape to it, kind of like a boomerrang. There was a smaller pit about fifty yards short of the green in the middle of the fairway, and complex of bunkers about 100 yards off the tee right before fairway began (those bunkeres do not appear in the 1938 aerial). Based on the configuration of the bunkers it looks like the hole could be played as a long-3 or a short-4. I'm wondering if it was more Redan than Biarritz, reverse Redan.