He was born in Paris in June 1896, according to La vie sportive du Nord (1912-12-21). He was managed by Francois Descamps.
Here are some of his fights which have not been listed in Boxrec yet:
1912-07-12 Paris (Premierland) (L'Aéro 1912-07-13)
Loesch vs Dastillon drew 10
Saint-Didier vs Christian drew
Balzac vs Laporte w ret 4
1912-08-07 Paris (Ring de Paris) (L'Aéro 1912-08-08)
Loesch vs Lepreux w pts 10
Dubourg vs Laporte w ret 6 (10) (Dubourg replaced Balzac in what was planned to be a return Balzac vs Laporte)
Young Weaver vs Young Chicken w ko 2 (8) (Young Chicken = Kid Chicken who had fought Criqui and Charles)
1912-08-30 Paris (Premierland) (L'Aéro 1912-08-31)
A Grassi vs Loesch w pts 10
Kid Harris vs Montgevin w ko 1 (10)
Young Weaver vs Jack Gatehouse drew 10
1913-08-17 Cabourg (Casino de Cabourg) (Gil Blas 1913-08-21)
Loesch vs Vittet drew 10
1913-11-15 Paris (Wonderland, Luna Park) (L'Aéro, Le Figaro 1913-11-16
Jeff Smith vs Bernard w pts 20
Legrand vs Loesch w pts 10
Niémen vs Constant Pluyette w pts 8
1914-02-12 Lens (La vie sportive du Nord 1914-02-21)
Loesch vs Campagne w ko 6 (10)
1914-05-02 Paris (Boxing-Buttes) (Gil Blas 1914-05-04)
Loesch vs Billy MacGuire w pts 10
1914-06-05 Paris (Premierland) (Le Figaro 1914-06-07)
Ledoux vs Durocher w ret 3 (15)
Loesch vs Francis Charles w diskv 3 (10)
Pionnier vs Grégoire w pts 8
Cordier vs Marieux w pts 6
