30-75 dollars,depending on overall condition and a good bore.
Single-shot shotguns are generally just utility guns and sell for $100 tops.
Check gunbroker. There's an info packet for sale telling all about 219, 219B, 219L The 219B was made after WWll until 1963. In ex. cond. it's worth 7-8 hundred. In poor cond., $125 - 250.
Value of ANY gun is based on exact make, model, and condition. You gave us one of the three items we need.
250-300 dollars in good shape fetching more on internet intrest on these has increased over the past few years