As promised a few more information on the frame:
first a pic of the neck casting number. No big surprise here. Although the major part of the casting has been ground away, the -56 on the neck is clearly visible.
- IMG_20181227_181918_001_small.jpg (475.3 KiB) Viewed 10784 times
Another pic of the lower footpeg bracket. Either the kick stand mount has been ground away very carefully or it never has been there.
- IMG_20181227_181932_882_small.jpg (241.37 KiB) Viewed 10784 times
The seat casting has additional tapped holes for (I assume) a "visible spring" seat. The holes on both sides are very accurate and are angled, so no backyard job here.
- IMG_20181229_214317_580_small.jpg (349.87 KiB) Viewed 10784 times
Overall weight of the frame is 33lbs -- I used my luggage scale for that, so maybe not too accurate. My 59 XLH frame (J8) weights 35lbs with the same scale.