Green’s Dictionary of Slang

Grecian bend n.¹

also Grecian bender

[ety. unknown]

a revolver.

1881		‘Bill Nye’ Bill Nye and Boomerang 252: Dangerous Davis caressed his brass-mounted Grecian bend.
1979		Maledicta III:2 160: Grecian bender n [...] 2: [DA 1880] Revolver.