I have found no markings indicating the country or year of origin. The instrument appears to be well made, and I do not see any obvious serious defects. There is one mark on the side back of the main body that is visible in the ninth photo, but no physical damage is associated with it.
The old piece is very thin and incomplete. Long Necked Mandola Octave Mandola" is in sale since Sunday, May 24, 2020.This item is in the category "Musical Instruments & Gear\String\Folk & World\Bouzoukis/Mandolas". The seller is "billy-hill" and is located in Cumberland, Maryland. This item can be shipped to United States.