The Model 098 TOPPER DELUXE was in production from 1974 - 1981, 20 ga or .410 bore; had a nickel finished receiver, and was the "deluxe" version of the more common Model 058. It was equipped with a 26" barrel with set chokes and had a black stained or painted hardwood furniture set. It was replaced in 1982 by the Model 099, 12, 16 or 20 ga and .410 bore, Walnut stained hardwood furniture; 25 to 28" barrels with fixed chokes and an "electroless nickel" finish. Disc. in 1986. Both have three piece takedown with a screw attached forearm. Screw should have a single slot - after Marlin took over production of the SBs, the screw pitch was changed and there is a "double cross" headed screw in use - which is not interchangeable with earlier models.