Check the twist yourselff with a fairly tight patch on a cleaning rod that rotates easily, with 12" marked off.
1-9 will shoot just about any bullet weight up to around 70 gr very well and a 1-12 will handle the 40-60 gr just as good for the most part, except the longest 60 gr hollow points and not too bad for the stubby Speer and Sierra 70 grainers, I shot a lot of those in 220 Swifts 1-14 way back...they helped make tons of venison jerky, steaks and hamburger.
Many of my large cased 22's have/had 1-14, 1-12, 1-10, 1-9, 1-8...most of my small cased 22's have 1-9, 1-12, 1-14...1-9 just because rifle makers jumped on the wagon when the heavier 69 gr military ammo came availabe to the general public...but for 55 gr bullets either twist will work just fine. Each rifle and barrel length has a preference in bullet weight and velocity.
The 223 and 55 gr ammo were pretty much developed side by side...in 1-14 twist barrels and for the most part(B4-69) ALL 22'c unless custom made had 1-14 twists up to a certain time...going way back to 220 Swift and 22-250. My TC Encore OEM 22-250, now 22-243 Midd, has a 1-12 twist...it shoots the 60 gr Hornady hollow point well enough even.
Hey...if the price is right, buy it...either way you wil have the basis for a very nice bigboytoy.