So I found this while going through some old stuff. Someone gave it to my dad 30 years ago and he doesnt remember what it is. It looks like it could be
Kalkulator Optima SS-501 - Tommy - Akcija - Njuškalo katalozi
Cris' site on antique mechanical four-species calculators
Optima Scientific Kalkulator SS-501 - Konzum
Optima Electronic Calculator 8 Digits 12x10.5cm ❤️ home delivery from the store Zakaz.ua
Calculator Optima ❤️ home delivery from the store Zakaz.ua