Congratulations and encouragement for Michael and Uwe for all this research task.

All these questions and these assumptions bring much confusion. Perhaps that new documents will be found and will bring evidence, to confirm or cancel all that.

Be careful in your conclusions.

Good courage

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Plus 51134 for Falchetto (or the other round, no idea).

No, Grand Saconnex.

The photo does not show 51137 but 4936.

4936 (T35C) then (T35C/51): Willy Escher (CH), Dr. Josef Karrer (CH), Nellie Braillard (CH) with 695-L, Degailler Markiewics (CH), Jean Augsburger (CH), Hans Matti (CH), Andreas Gantner (CH),

51134: Willy Escher (CH) 1932, Nellie Braillard (CH) with 695-L

4936 modified with T51 engine in 1933.
51134 delivered in 1931.
It is not the same car.

4936 and 51134 with 695-L (CH) and Braillard

Perhaps that Nellie Braillard forever bought the 51134.

Type 35C/51 Grand Prix 1929 (4936) 695-L (CH), #36 II° Grand Prix de la Marne, 2nd July 1933, Louis Braillard DNF

you have the evidence that car in the photo is 4936?
race number 36 Louis Braillard T51 2.3-litre

No, never.

Of course not. As generally known Swiss registrations do not belong to a car but to a person or entity.

Yes.

Correct, but the "36" has nothing to do with the Marne GP 1933, just coincidence. Unlikely that they raced 51137 there with sports car equipment.

So much about identification of cars by registration....

Add lightness.Who needs suspension anyway !

Look at his face - I believe at this current moment a suspension was his biggest wish....

4936 currently with crank case 51136? H.G.Conway said crank case 51125
my opinion:
4936 with crank case 51136
51136 with crank case 51125 (so 51136 previously listed as 51125))

I do not know what engine currently sits in which car, and frankly spoken I do not care. My interest is the history of the cars in their active period.
4936 was owned by Willy Escher, and driven by him and also his friend and business partner Dr. Josef Karrer. Later also Louis, the brother of Escher's spouse (and later wife) Nelly Braillard, was allowed to race it when Escher himself retired from active motorsport. 4936 was substituted by 51137, and sold to Edgard Markiewicz - still as T35C. There is no relation between both cars except that they had the same first owner.

Currently 4936 a engine T51.
Or then they are not the 4936 of origin, they would be two different cars using 695-L (CH)

The 51137 is another car.

At least 3, possibly more!
"695-L" (Zürich) was Willy Escher's personal registration which was also used for different BUCAR cars as he was the owner of that company.