Vintage Wool Jacket Blazer Coat Mens Large

You are looking at a rare Vintage Wool Blazer Jacket in Mens size Large Top is in excellent worn condition with minimal signs of wear... No holes, rips, or anything I could notice Jacket says size 1 but I and not exactly sure what it is reference to nor do I know much about this brand. I did try the jacket on myself and it definitely fits like a modern mens size large Pit to pit: - 25" Inches Length shoulder to bottom: 30” inches Shoulder Across: - 23" Inches Sleeve Length: - 34" Inches