Ithaca had Tikka build for them M55 and M65's with the Ithaca name on them. Ithaca called them LSA-55 and LSA-65. Research I've done shows this was done from about '69 to '77.
This was before Tikka was affiliated with Sako.
According to Sako's website they took over Tikka in 1983.
Sako history | SAKO