I wonder when they switched to cantis and moved the second bottle braze-on from the bottom of the down tube to the seat tube. I suspect the 500 out in the barn is a couple of years older than yours:
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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.)