You will have to contact Rossi
That firearm was made in Brazil by Rossi and imported into the US by Firearms Int'l. Importation ceased in 1968 with passage of Firearms law restricting importation of many inexpensive, small handgun. Current value is less than $100 RETAIL, probably closer to $75.
Almost certainly NOT an antique. Made by Leinad Inc. in Ducktown, TN. They also made a side by side .410/.45 derringer. I have one and it is very impressive to shoot.
Louise Rossi has written: 'Side-lights on Shakspere' -- subject(s): Study, Criticism and interpretation
s.leopoldo r.g.s.22l.r.
499.00
$50-100. Most were in .45 caliber. Many were sold in kit form.
Check the top of the receiver and under the forearm.
I have one and it is a 7x57 caliber is stamped on the left side of the barrel.
Depending on the age, it may not have one. Serial numbers on rifles and shotguns were not required by law until 1968. Rossi shotguns that DO have a SN usually have them just forward of the trigger guard. However, contact the Customer Service staff of Taurus (they own Rossi) to check your shotgun.
Pass side of the engine.
You will have to seek a qualifed appraiser.
Under the hood, driver side.