Has a few of those Sea Horses, plus a Clarke like this one. The one he has has the original case and manual, all pretty much mint, a real beauty.

https://www.worthpoint.com/worthopedia/clarke-troller-1939-one-rarest-1808623001

This is a complete Clarke Troller. I do not know much about it or it's background but I can say that it appears to have good compression and I pulled the cover and it does have spark. (sparked between points) The serial number is TP391808 which I believe makes it a 1938.
This is a rare outboard. The motor is under the water and the prop is connected to the crankshaft of the motor. The points and spark plug/condensor are also submerged. Just the 1 quart gas tank and carburetor and coil are above water. It is only 21-inches in length and weighs approximately 10 pounds.
The Clarke Troller may be the most unusual outboard motor ever made. It was developed by D.R. Clarke and his Clarke Engineering Company in Detroit, Michigan because Clarke was unhappy with the cantankerous outboard motors of the day. What made it so unique was that the 1.2 HP motor was completely underwater in the lower unit! This made it easier to cool and made the need for gears obsolete because the prop shaft acted as the crankshaft! You started the motor by putting a rope around a sheave on the propeller then lowered it into the water once started. The top of the motor held the coil, gas tank, and carburetor controls. These were battery ignition not magneto. The Clarke Troller was only made from 1937 to 1941 and sold for $35. It was 21 inches high and 10 lbs. and fit into it's own canvas carry bag! Very rare and highly sought after by collectors. This motor has had one repair on the cavitation plate. Looks like an old fix of the plate and it was riveted. This would be a very easy repair to have it welded as it is all aluminum and not pot metal aluminum. Please look at the photos carefully. I don't know much about the motor. It does turn over and appears to have good solid compression. I did see spark but it was between the points when I pulled the rope. I have not been able to get it running. I did not put gas in the tank. I only dripped it into the carb. This appears to be a complete Clarke and appears to be complete but I don't know much more about them than what I have read on line. They appear to be very rare.
This motor also has the very desirable variable pitch propeller. It can be adjusted by loosening 2 screws and turning the two brass blades.
Plus this one has the original tool kit which includes the plug socket, and handle/screwdriver. I am selling for an elderly family member so please bid accordingly.

Got her all boxed up and ready to mail. Looked in the points and plug area again and it appears that the small thin wire clip that goes on the spark plug may be broken. Should be a very easy fix to solder a new one on the plug wire. It looks just like one of the so-called jesus clips but missing one side. It still makes contact with the plug but this may be why the spark that I saw was between the points as mentioned above The points will now need to be adjusted also as I moved them and don't have a feeler gauge. It is a very small tight area where the plug and points are located. How they engineered these I have no idea.