All the Win-Tac will have a “W” prefix with numbers and are Bartliens. There were some Hawk Hills on ATX’s, for those you would need to look at the number of grooves.
All Lothar Wothar stuff will be marked with their proof marks near the chamber.
If it's been chopped or painted and you have a borescope you can also look at the lands. All the Bart's I have regardless of caliber have 5R/trapezoid shaped lands.
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