The ten vehicles, N° 84252 - 84261, were only delivered between 14 and 16 December 1937, after having been tested between 1 September and 22 November 1937 by the "Commission de Vincennes". The delay of three years could not be entirely be blamed to Renault: the different Arms for which the YSs were intended each had special requirements for the combinations of (short and long range) radio sets to be built in. Some of the latter even yet had to be developed — the first specifications were only issued in June 1935 — and afterwards for each subtype a special interference suppression had to be applied and thoroughly tested. For these tests the original two prototypes were used.