1938 Canadian 50 Cent Error

I just lucked into a nice example of an AU+ with the line between the flagpole finial and the 50, does anybody know a ballpark of what something like this should be auctioned starting at? I'm flabbergasted at the quality of this coin, with a nice yellowing on both sides in the center of the silver, and no wear to speak of. K Mint marking, definately the Die Crack error mentioned by Castor at https://www.coinsandcanada.com/coin...0-cents-1938

I'll attach photos in a bit. Going to get this pro graded, of course.

Thanks, Matthew