Other than the style of engraving, the Samuel Curtis appears to be essentially the same as the Warren. At least the train, ratchet bridge and potance on this movement (and on serial # 899) are the same as on Warren 44. However, it does not have stop works (no Samuel Curtis yet has been reported to have stop works except for a custom/private label version serial # 170 signed John Warren).
Standard Samuel Curtis movements are fitted with 15 jewels and jewel settings on the top plate. They are also undersprung with a solid steel balance. The porcelain dial with Roman numerals on this example is not signed and the seconds bit is not sunk. (Pictures of Curtis 677 have been used to supplement the picture of 277. #677 is a typical cased example.)
