Given the lack of specific data points such as selling prices, offers accepted, and listed prices of similar cars, I will use the new car price and apply depreciation logic. Assuming a new 2018 Mercedes CLA220 I4 2.0L Turbocharged Standard sedan had a price of 200,000 SAR, we apply a 10% depreciation per year. For 6 years (2018 to 2024), the depreciation would be 60%. Therefore, the estimated value would be 40% of the original price, which is 80,000 SAR. Adjusting for the high mileage (137,000 km) and non-GCC specs, I would further reduce the price by 10%, resulting in an estimated price of 72,000 SAR.