hello jarni,

welcome to the forum.

your machine looks to be a contract build done for a retailer.

Cicli Marcon Moto | Triesteshop.it

Sig. Marcon's first name is Flavio.

the bicycle's Agrati bulge-formed head marks it as an absolute base model cycle. the frame's lugset, bottom bracket shell, fork crown and frame ends constitute and Agrati group called ART. 000.8050/U "SPORT."

pedals are Sheffield brand.

difficult to say who the actual manufacturer is. you could contact the store to see if anyone there could help. the bicycle's serial number may lead to a specific date of manufacture.