A little more looking and I found that S&W's Blazer line was leather but
the 19 was a duplicate line made with wessonhide. Therefore I was able
to find a size 7 Blazer. It was made for the Colt Single Action Army or
Peacemaker (if you prefer), similiarly sized clones, and some Ruger
Blackhawks. I believe your holster is the wessonhide made for the
Colt SAA or Peacemaker with 7.5" barrel.

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In Omnia Paratus