Many manufacturers have sn data on their website. Proofhouse.com also has sn data for some makes.
It would tell the year when it was produced.
Blue Book of Gun Values, Standard Catalog of Firearms
Blue Book of Gun Values
Contacting Colt and getting a letter would be a good start.
Warren Buxton's book on the P38 are a good place to start
Highly unlikely that sn info is available. Highly unlikely that sn info is available.
is it a 25 cal ??? is it a 32 cal ???? is it a 380 caliber ???? that info might help....
I am certain there are a lot of users of the Makarov pistol out there. You may find some additional info on the pistol at surplusrifle.com. You may compare notes with Makarov owners at several on-line forums. Search for "makarov forum" and see what you get.
I would need to know the Browning model number besides the serial number to get you any info on your semi-auto browning pistol.
if you are looking for history forget it. none with lugers. value would depend on overall condition
Requires professional appraisal
You look up "find number " on internet. There are companies that will find and sell that info to you. Cost about 2-5 $