A view of the Model 1842 Preußen Infantry Mannschaften (Other Ranks) Landwehr Pickelhaube profile. The height of this helmet is shown nicely in this photograph.

Sitting on a flat surface, the helmet measures an incredible 38cm tall (15 inches) tall.

The helmet would have originally been issued with a 75mm leather Preußen Kokarde in the national colors of black/white/black, however, this example carries the massive 75mm metal Preußen Kokarde introduced in 1857; probably added when the helmet was issued to the Landwehr or Reserve.
The liner of the M1842 Pickelhaube was of heavy leather with rounded "tongues" perforated at the ends for a leather string to adjust the fit. The rear visor has curled inward from the effects of time, unlike the front visor which carries a thick brass trim. Of interest, the rear visor has a sewn leather edge, similar to what is found on the rear visor of Officer Pickelhaubes right up until 1918.

Note that all the brass threaded bolts for securing the brass fittings to the shell are all domed.