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M39 / M44 Breast Eagle
The correct chest eagle for late war tunics and shirts are the Bevo style which uses a thin rayon style thread supplied as a length of ribbon which needs trimming to shape then sewing on the right side of the uniform.
The best way to go about fitting the rayon type is trim it to shape leaving approx 4mm around the eagle then folding the edges over and using a small amount of bicycle puncture repair glue to stick it down ( don’t over apply it as you will find it hard getting a needle through ) , with either straight stitches or zig-zag.
These collar tabs / markings are used to identify the unit which the soldier belonged, the only two types that we use are the late war green for Army and pink for Panzer / Armoured crew, depending which part of the unit you join you will need the correct ones.
M40 EM Shoulder Boards feldgrau wool with green piping for Panzergrenadiers, or Pink for Armoured Vehicle and Tank crews.