Certainly the slightly earlier 57/8 series 1 had that horn button (and I thought the very early series 2 were the same).  As far as the indicator switch is concerned that was certainly a period option for the late series 1s.  So if the series 2 did not have indicators then if fitted later, that switch would have been used.
Cheers 
Garry
				
			 
			
		 
			
				
			
			
				REMLR 243
2007 Range Rover Sport TDV6
1977 FC 101 
1976 Jaguar XJ12C
1973 Haflinger AP700
1971 Jaguar V12 E-Type Series 3 Roadster
1957 Series 1 88"
1957 Series 1 88" Station Wagon
			
			
		 
	
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