You will need to take it to a gunsmith
Try the on line auctions like auction arms and gun broker, there are pictures of them there. You may have to look in the archives, but there are several pictures of many models.
twice the caliper plus 2 or 67 max
Ask a gunsmith for help.
10-100 usd
The .45 caliber muzzleloading rifles, made in Spain, marked "Jukar" seem to date from the late 1960s- early 1970s.
i need a hammer for my jukar spain 45 cal serial # 097443
what is the value of a jukar black powder pistol 007806
The value of a Jukar 033030 Spain flintlock can vary based on its condition, age, and market demand, but it typically ranges from $200 to $500. Factors such as provenance, any unique features, and whether it includes original accessories can also influence its worth. For an accurate appraisal, it's advisable to consult a firearms expert or appraiser familiar with historical firearms.
Jukar indicates a modern reproduction of a muzzleloader- but there were pistols and rifles- and you don't tell us what you have, or condition. These are fairly low cost- rifles are about $150, pistols about $80
Impossible to answer with the information you have provided. Sort of like "How much is a V-8 car and how old is it?"
depending on condition, $100-$150.