My initial thought was that the first pic was a demonstration board, the sort you see in a wholesaler's showroom to illustrate their range of devices.

I wonder why the Sheraton went to the trouble of labeling the Shucko outlet "European socket" though? [Linked Image]

You'd think that Continental visitors in London would recognize what it is without being told. Actually, I just had a thought: Maybe it was to stop ignorant Brits asking what it was for!

I'll lay you 10:1 odds that the "U.S. 110 volts" receptacle is 50Hz as well. Looks as though with it right next to a British outlet they didn't debate ground-up vs. ground-down too much! [Linked Image]