It is an initial issue of a Class 1 with OML
That's definitely cause for heartiest congratulations ! It may not be an absolute first, but in my experience the OML restriction is mostly used in
existing class 1 holders, who subsequently develop a condition or a situation where full class 1 fitness is dubious, even if only temporarily.
What is the medical reason for the OML ? ( as you say, you simply sailed easily through most of the medical ). Sorry, others may know your past background, but I've joined here only relatively recently ! Just wondering if it's something which might be deemed permanent.
Good luck with your training, and even more so getting that first "foot on the ladder" flying job !