Lightsaber Hilt Variants
At least three variants of this part are noted.

KEY
v1
v2
v3
A Top Stud
more-rounded top, stud hollow contains LEGO
less-rounded top, stud hollow contains LEGO
less-rounded top, stud hollow contains LEGO
B Double-collar
higher-positioned on bar, smaller gap between collars
lower positioned on bar, wider gap between collars
higher-positioned on bar, smaller gap between collars
C Collar join
squared
rounded
squared
D Bracket
squared top join at bar; similar top attachment point as v2
angled top join at bar; similar top attachment point as v1, shorter bracket with similar shape compared to v3
angled top join at bar; higher top attachment compared to v1 and v2, taller bracket with similar shape compared to v2
E Pedestal
rounded and stepped pedestal with pronounced seam at bracket edge
solid pedestal, no seam at bracket edge
solid pedestal, slight seam at bracket edge
F Bottom Stud
more-rounded bottom, stud hollow contains © and mold number
less-rounded bottom, stud hollow contains © and mold number
less-rounded bottom, stud hollow contains 64567 ©LEGO and mold number
Additional notes: I suspect v2 is the earliest version as this part is found in chrome silver (1999). v1 follows as this part is found in metallic silver (2009). v3 is latest with the 64567 stamp.