I attach images of my earliest snap tinder lock with a lateral push button release, ca. 1510-15. 
 
It was in heavily rusty excavated condition when I got it, with the cock frozen in the cocked position (!) - and still the one armed spring had retained much of its original tension ... 
 
A close before/after comparison should illustrate that the long time and careful restoration work has really saved the extremely rare piece. 
 
Michael
		 
		
		
		
			
		
		
		
		
		
		
		
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