Tubing should be Miyata's proprietary triple-butted chro-mo. I don't remember if the 712s were splined or not. Pretty sure the 912s were, but my 512 was not.
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You know it's going to be a good day when the stem and seatpost come right out.
(looking for a picture and not seeing it? Thank the Photobucket fiasco.PM me and I'll link it up.)