I wouldn't buy a leather jacket like that unseen off ebay TBH. I have seen jackets advertised as "motorcycle" before where in actual fact, "motorcycle style" would have been more accurate. There are jackets out there that look the part, but are only really a style thing, and would give very little protection in the event of a spill. Without at least knowing the manufacturer, I would steer clear.
But funny you should say about going back to a leather jacket after years with textiles; I've just done the exact same thing. Just got myself an Alpine Stars Jaws leather jacket from work for summer use (plus 2 HJC helmets and A* summer riding shoes). As I'll be leaving the job soon, thought I'd stock up while I can get it all cheap, as I've kicked myself in the past for not doing so!