Measure the inside barrel diameter and chokes. WS1 was a bell choke, one that actually had a reverse taper optimized for 21 yard skeet targets. I've never heard of a factory 24" barrel, especially on a skeet gun, but it's possible as a custom option. Measuring the barrel and chokes will tell the tale.

My guess is that the barrel is bobbed, and I'll likewise bett that the barrel choke is a true cylinder.