Infantry Assault badge in silver (Schauerte & Höhfeld)

 The "S" mark is a known
attribution for Schauerte & Höhfeld (S&H).
While the firm also used the multi-letter mark "S.H.u.Co," early-to-mid-war examples frequently featured this single-letter variant.Got that description from google as unsure of single letter S marking.click on pay by credit card to activate after pay.