Like restoring things? These helmets are perfect! Can be used for restoration, or, believe it or not, arts and craft projects. The shells will be in good sound condition, but may will rust as pictured. Liners are, for the most part, screwed, but if you're good at restoring things, these will be a great project.
Most are dated in the 1950s.
If you just want an example to have on display or just to have in your collection, this is the cheapest best way to do that. The Czechs used The M1952 helmet from 1952 through the 1990s. Patterned after the Soviet SSh40 with a simple liner, these were the go-to for the Czech Military and Slovakian Military for decades.
NOTES: No returns on these, they're being sold as-is, which is not great shape. These are going to be in rough shape, and it appears these were stored in a not-so-great facility for many years.