I sold two of these here last year, a 243 and 308.
https://www.24hourcampfire.com/ubbthreads/ubbthreads.php/topics/9677010/Re:_FS:_Tikka_Ithaca_LSA-55_De#Post9677010
They are beautiful rifles, but being a lefty they just didn't work for me. The tapered dovetail on top is the same as my Sako L579, right down to the recoil lug spot at the rear.
That is interesting, all the Tikka LSA and M series I have owned or handled had straight dovetails rather than tapered like the Sako rifles.