SIg P238 slide width

[MattyBoy]

When I started looking for a 238 I went to a couple of LGS. The first place I went had one with a thin slide. I went to a couple other stores and the ones they had had a wider slide.I ended up at the first store and bought the one with the thinner slide. Did Sig change there slides and I have an older one or was that a certain model that was like that?