Not the greatest pic, but this is from the new to me SM 300M 2254.50, dating from the early '00s. Sunlight stimulation only:
Some awesome lumed Speedmaster bezels here! This is my Stowa Flieger at night. I love the full length, fully lumed sweep hand.
Be a recent recipient of two vintage Omegas, I do miss the Lyme on my modern Seiko work watch. Some beautiful watches on this thread.
RGM 801- Corps of Engineers. Hand made in Mt. Joy, Pennsylvania. Check it out...oh, and the dial is grand feu enamel! @Larry S