What is the value and year of my lefever nitro special 12 gauge double 30in barrel with dual triggers ser 254198?

The value of a Lefever Nitro Special 12 gauge shotgun with a 30-inch barrel and dual triggers can vary based on its condition, age, and specific features. Generally, these shotguns can range from $500 to $1,500. Given that your serial number is 254198, it likely dates to the early to mid-20th century, but for an accurate appraisal, consulting a firearms expert or a recent auction would be advisable.