Best to ask a gunsmith for assistance.
Yes
No
Imported from Spain in the sixties and current value depending on conditgion is $650-$950.
a 410 ga. shotgun pistol was made by crescent firearms and is very rare. however, regular shotguns do not have much value
10-100 USD or so
how old is my new England firearms 410 shotgun ser# NR-378884
Davidson's is a firearms dealer. You can learn more about Davidson's from the DavdisonsInc website. Once on the page, scroll to the bottom and click on Company Information.
How old is it an what condition is it in?
100-150$
You can get a manual for free at the S&W website.
None. While there are firearms made to shoot .45 Colt AND .410 shotshells, they are designed and made to do that. A regular .410 shotgun is NOT made to do that safely.
Marketed by Firearms International of Washington as the Garcia Broco 22/410 from 1976-1978, the Blue Book lists a FAIR condition as about $115.