He's legit. I know him personally. The doubts on SZ concern another guy, not this one. This guy (not the SZ guy but the one you were asking about) has a consignment store where some stuff comes from the SZ guy.
Selling this awesome blazer that speaks for itself and does not need much introduction.
Material: wool blend
Size: M (48/slim 50)
Condition: pre-owned, excellent
shoulder to shoulder: 17 inches
pit to pit: 21.5 inches
length: 29 inches
Worldwide shipping with tracking for $25