Hello James,
as always I really appreciate your commitment to research, I am very sorry to have caused doubts or uncertainties and I apologize for this.
In reality I think that normally things are exactly as you say, the only regular model of yugo para is the Pc99; I also know the non-ballistic Chinese helmet GK82.
The helmet I mentioned is reported in the Yugoslavia / Serbia section in an Italian book well known in my part: "Combat helmet of the world" by Paolo Marzetti, which I read a while ago, and I was intrigued because it was something unknown to me.
For what I remember, it is a M59 with a shortened rear flap, a modified leather chin strap, and a liner that reminded me of the Polish helmets Wz67; probably an experimental version or an emergency modification.
Currently I can not tell you more.
Ps: I post my fiber glass Pc99, unfortunately lost the chin strap as often happens on these helmets!
Regards
Roberto
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