I offer to your attention winter boots, several similar types of boots were used in the Wehrmacht. Found in the basement of an old house.
The condition is very good, the leather is not dry, does not crack. The leather sole is glued with rubber protection. The size, as far as I could measure, is most likely 42.
There are no insoles, so I measured inside with a tape measure. It turned out to be 27 cm. On the sole - 29.5.