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