In most cases the only way to tell is if the company is still around. You can contact them with the # and get at least an date range. Some of the Spanish guns have a date suffix in the serial number ( 12-123456789-95) would be a 1995 manufacture. Others you can determine by when the model was made and compare it to the number made and have a guess at the year. One book may help, The blue book of modern black powder values has some good information, and may answer the question.
No published sn data.
There were thousands of black powder guns made in Spain in any given year. These range from very cheap to well made. You did not give us much information to work on- whether it is a rifle, shotgun, pistol, or cannon.
There is a LETTER in a square on the barrel that can indicate year of manufacture. Most are modern reproductions made from about 1970-1995 or so.
The first feasible production firearm designed around a form of smokeless powder was the model 1886 Lebel rifle, which used the Poudre B powder invented by Paul Vieille. It was designed in 1885, and production began in 1887. It fired a 8x50R cartridge.
In the year 1898 or 1892.
Those are hard to find these days, the last one I saw sold at auction about a year ago for $200 in 95% condition. I have seen them sell higher $450 but they were new in the box.Lot # 820 Kull's Old Town StationIthaca Muzzle Loading Black Powder Rifle.Lot # 820 - Ithaca - muzzle loading black powder rifle. - . 50 cal. ; very good condition. ; 95%+ with some light rust, notably towards muzzle; working; excellent wood. ; ; s/n ; non-ffl est. 100 to 200
You can contact Thompson Center Customer Service through their website for help. They are still in business, you know. BTW, really good rifles.
No sn data that I am aware of.
You will have to call them to find out.
You will have to call the maker.
You will have to contact Kimber to find out.
You will have to contact Weatherby to find out.