First the product code used, The S&W cat. says that that product code was used for many different variations. (not normal) There were 8000 RB 3" barrels made for Lew Horton made between 86 & 87. The ALD S/N falls in that range. It was produced in 1986 on the 44th day of the year (Feb. 86)
The BBA was produced in 1988 on the 193rd day of the year. (July 88) So if one of them is a Lew Horton, I would say it is the ALD S/N, But I can't say conclusively because that product code was used for many different variations. But it would be a 3" barrel w/round butt. sorry I could not be more help.
