No correspondence. A junior officer and NCO from an unidentified Feldartillerie regiment modelling what appears some kind of portable sound locating apparatus. One can't help but automatically jump to the conclusion that these fellows must belong to an anti-aircraft battery, which would explain the sound-detection gear, but the AA role was performed by the Air Service, not the artillery. Another mystery for the files.
MONTERA HAT: Traditional Spanish hat worn by bullfighters, introduced to the ritual event in 1835 by Francisco 'Paquiro' Montes accompaniment to the traje de luces, or "suit of lights". Aso said to be Walt Disney´s main inspiration for the creation of Mikey Mouse. The montera hat is habitually covered in astrakhan fur with an inner lining of velvet, the image of a saint is sometimes printed on the lining as a talisman of good luck.