sg188SG188. 1883 1½d Lilac . SG188a. watermark sideways. Specimen. Specimen. Multiple. Watermark. Imperial Crown. Watermark. Showing the watermark as seen on the reverse ofHow to get SG188 into Bluetooth Pairing Mode? April 01, 2025 06:43; Open the two frames. Wait for a few seconds it will enter pairing mode automatically, the LED will flash Blue&Red.; Note: