Only fault I would find is they don’t idle as well as pre-1968 models. So if you want an all-day trolling motor, this probably isn’t it. Otherwise, a good motor and better than some that followed it in later years.

As always, condition is everything.

You be the judge on the price. I’m too cheap.

EDIT: Maybe I was too harsh. The ’69 idled pretty well, just not as good as they used to be. They didn’t manage to make a really poor idling "improvement" till 1973.

Well, $600 for a 69 25hp is pretty steep, so it had better be in pretty nice cosmetic and mechanical shape. I’m assuming it has never seen salt water as well. Check it over carefully, look for bent/cracked/broken castings. Make sure the gearcase skeg is in good shape and not bent/chipped.
I would surely crack the lower gear lube fill screw to ensure the lube is clean/no water. Check compression and look for signs over overheating.
These engines/gearcases seem prone to clutch dog wear and those repairs are expensive. Unfortunately, there is no way of knowing if this problem exists without running it on a boat.
Please don’t misinterpret my comments, these are good engines. BUT, $600 is a premium price for the engine so I want you to do everything possible to make sure the engine’s condition warrants the price. And, I’m not sure just how many parts are interchangeable between this engine and older ones.

You didn’t mention it is electric start. And he "claims" it runs like a champ. I can’t tell you what that’s worth in your area, you will have to decide. And I imagine you might not want to wait all summer (year) to get something repaired and running. Or does time matter to you?

BTW, there is a meet on June 20 at Ft Laramie OH. I believe I drive more miles to some meets than that. Consider running a free want ad on the Webvertize pages. You might connect with somebody that can deliver to the meet.