MSRP stands for Manufacturer's Suggested Retail Price (also known as List Price) and is used to guide retailers in pricing, and to standardize prices across retailers. However, most goods never sell at full MSRP. Most guitars sell around 30-40% off MSRP.
So, if you are looking to get an idea of what your older Samick would cost new today, take about 35% off the listed MSRP and then use an inflation calculator (I recommend this one: bls.gov) to adjust for currency inflation. That could also be taken into consideration in determining what it's worth now, if you are looking to sell (just remember that Korean instruments do not have high resale values).