I also use a Galco Fletch holster, with a thumb break.
An "alternative" would be order a holster from somewhere like Mitch Rosen, where it will be fitted a model without a rail, which except for a recent TALO model hasn't been produced for quite a few years. https://mitchrosen.com/products/holsters/ Mitch Rosen has been supplying Sig with leather holsters with Sig Sauer branding, for quite a few years.
I have an issue safariland paddle if interested. Used two days and then went with my old worn out Galco....lol. I think I may have a new Galco as well. Like Willard said thumb break style. But I may have a new Galco thumb break. I don't do Kydex as they are so Millennial....lol
I've carried a 1988-era P226 in a OWB Bianchi® Model 19L for 30+ years - it's a very secure thumb-break holster and suede-lined. (No rails or Kydex for me!) Another benefit is it also works with my P228.
You also should check out Craft Holsters - they have a few OWB's you might like.
FWIW, my Blade-Tech Signature holster fits my rail-less 2017 P226 Classic Carry and it fits my newish P220’s, both with rails. But it doesn’t properly fit my rail-less 1988 P226; ie I can’t achieve that normal “clicking in” when holstering.
I had quickly ordered that holster for a class and it was described as for the “P220/P226”. But, the lack or inclusion of a rail is not overly relevant for its fit.
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