Hello Eric
An A1S would not have had Vulcan Steel barrels but rather would have had Peerless Steel barrels.
Yours was originally made as a Vulcan, or Grade-0 which was the lowest of the grades and, due to the lack of virtually any engraving, lent itself as a perfect candidate for a total upgrade. I can't say for certain but yours bears striking resemblances to some known Pachmayer (sp) upgrades.
Ooops... I just noticed the W. Kalouch notation.
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