Separable slide fastener

A top end stop (3) of one of opposed fastener stringers (10) of a separable slide fastener has an obtusely angled configuration composed of longitudinally continuous and integral first and second half parts (3a, 3b). Each of the first and second half parts (3a, 3b) has a maximum width (W1, W2) equal to or slightly smaller than the width (W4) of each branch (25) of a Y-shaped guide channel (24) of a slider (2) so that the top end stop (3) can pass through the guide channel branch (25) as it is moved in a C-shaped path. The top end stop (3) has a maximum width (W3), as measured perpendicularly to an inner longitudinal edge (11) of the tape (10), larger than the width (W4) of the guide channel branch (25), and hence cannot pass through the guide channel branch (25) as it is moved simply in a straight path.