Of the 927 steel frame Model 39's, I haven't seen many in the 81XXX serial number range, in fact I've only come across a dozen of them. Here's a list I compiled and feel free to add to it if you can.
81781, 81782, 81783, 81784, 81785, 81786, 81787, 81788
81789, 81790, 81791, 81143
81781, 81782, 81783, 81784, 81785, 81786, 81787, 81788
81789, 81790, 81791, 81143