I like the way chrome came off on both of them. Your radium survived bit better. Is that same size case ??
I can ask Omega about the number and archives, I have seen only 4 of these same watches in the past with black secotor dials.
My movement is 88899xx
I have always believed these were mainly sold in eastern Europe, I could be wrong but most of these big 37mm 26.5s I have had in the past seem to come from there.
Thanks Michael