Have you any idea how old it is or more info?
It's one of two things - either a very early alto, possibly pre-WWI. Or one of what someone here referred to as a saxophone shaped object, a junk indian copy of an original Sax alto. The neck angle is like an early Sax sax, if so you'd expect it to have 2 octave keys. Also the instrument is keyed down to B, not Bb, which explains the 'missing' key on the bell - normal on early saxes.
Comparing it to my early alto the bell brace/neck brace look too modern. Keywork also looks too modern - the 'pearls' on the key touches, rollers on the C/Eb and the LH table. I remember reading that the Indian junkers had red pads, can't tell from here.
Better pics would help, but I'm a tad suspicious and without good evidence that it's an old instrument, I'd treat it as a saxophone shaped object.