WH (Heer) Slip-ons for the 'Pionier-Bataillon 33'

This is a nice matching pair of WH (Heer) Shoulder Strap 'slip-ons' ('Überschübe') as intended for a 'Soldat des Pionier-Bataillon 33'. The pair is showing the nicely 'chain-stitched' embroidered regimental numbers '33' in black on a fieldgrey woolen background. The black branch-colour is indicating a soldier within an Engineer unit. The pair shows some minor traces of years of storage. Nice pair in good unissued condition!