Leica M4-P Instructions Manual page 5

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13 Window illuminating the bright-line
frames
14 Field-of-view selector
15 Viewfinder field window
16 Folding rewind crank
17 Carrying-strap eyelets
18 Measuring-viewfinder eyepiece
19 Baseplate lock
20 Contact bush for flashbulbs
21 Contact bush for electronic flash units
22 Film indicator (takes ball-pen writing)
with DIN/ASA comparison scale
23 Tripod thread A¼ (¼")
5