If is .22 short
Winchester-Western East Alton (Illinois)
If is .22lr
Betwen 1910 and 1969: Western cartridge Co., after 1969: Winchester-Western New Haven (Connecticut)
That info I get it from Municion.org
that is a useful website about ammo from Spain (the info is in spanish). They not say nothing before 1910... but is probable that was made by Western cartridge Co.