The RS2: RS1 performance at a fraction of the cost. Features: Group 1 RS1 frame., Group 1 RS1 cold forged racing stem, Dia Compe MX901/Tech 6 braking, Chen Sheng Tyres, Araya alloy rims, Suzue hubs, Viscount Dominator saddle, chromoly fork, chromoly one-piece crank, chromoly seat post. The RS2: The pros like its performance... The novices like its price.
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Made in Taiwan.
Here's how to check your Haro BMX serial number. First 2 numbers in the serial indicates year of production (1986 or 1987). Numbers indicated by XX in the serial are Month (05 - 12 - May to Dec). YY in the serial indicates production Month (01 to 04 - Jan to April).
Bikes made in Taiwan usually had an 8 month production and shipping timeline before they were sold in bike shops around the world. In May of any year, factories would usually switch production to making models for the following year.