This is an unnumbered armorer's replacement bolt for a G.33/40.  It is the only example I have come across.

Image of g33_40_bolt-111.jpg

Image of g33_40_bolt-112.jpg

Image of g33_40_bolt-113.jpg

Image of g33_40_bolt-167.jpg

Image of g33_40_bolt-114.jpg

Image of g33_40_bolt-117.jpg

Image of g33_40_bolt-118.jpg

Image of g33_40_bolt-119.jpg

Image of g33_40_bolt-122.jpg

Image of g33_40_bolt-123.jpg

Image of g33_40_bolt-120.jpg

Image of g33_40_bolt-168.jpg