The 1148 in 410 ga. was introduced in 1954 and discontinued in 1969.
50-200
100-325 USD
1949-1968
100-300 USD depending on condition.
Saw one for $200 earlier this year
Can't be answered without the sn.
Your question answers itself.
You can contact Remington directly to see if they have any parts supply left for the model 1148,or you can attend gunshows,look on the internet,pawn shops,etc.
It's date code stamped on the barrel, see related links for information on the Remington Society of America.
100-1000 USD depending on specifics.
The anchor marking is a final inspection proofmark. It has no connotation with any naval service. www.countrygunsmith.net