There are various types of German (17) fuzes some have 2 charging heads others just the one ! some fuzes the clocks are enclosed in ali sleeves in others plastic sleeves.
All very confusing for collectors who have just joined this facinating hobby.
Below you will see the various types of (17) fuze from the early ones with the clock screwed into the base to the more normal totally enclosed cases.
Where possible i have attached the gaines to the bottom.



1 st model with external clock with waterproof band



Emergency patt with steel lower half



1940 pattern with ali sleeve



Internal of 1940 patt



1941 pattern with plastic sleeve



internal view showing plastic sleeve



Unmarked fuzes with ali sleeve

HEADS



Early (17) with 2 pins



Unmarked (17) 2 pin



(17) 1 pin