In December 1938, Francisco Alférez Jiménez served in the 4^a/26, which was equipped with the Polikarpov I-15.

On 30 December, he claimed a CR.32.

It seems that he moved to the 1^a/26 (I-15) around New Year 1938-1939.

On 21 January, he claimed a Ju 87 while reportedly serving in the 1^a/26 (I-15).

Alférez ended the Spanish Civil War with 2 biplane victories.
It is also possible that this is two different persons.

Claims:

Kill no.	Date	Time	Number	Type	Result	Plane type	Serial no.	Locality	Unit
	1938
1	30/12/38		1	CR.32	Destroyed	I-15			4a/26
	1939
2	21/01/39		1	Ju 87	Destroyed	I-15			1a/26

Biplane victories: 2 destroyed.
TOTAL: 2 destroyed.

Sources:
Spanish Republican Aces – Rafael A Permuy López, 2012 Osprey Publishing, Oxford, ISBN 978-1-84908-668-4