I don't have a good photo at the moment, but my contribution is a Diamondback Crestview tourer, SN 7445. The number is stamped longitudinally, along the circumference of the left side of the bottom bracket. I bought it as a bare frame (bare of much paint, even) so I have no idea what it's OEM components were, except it obviously had canti brakes. I've been assuming it's from the early 90's. The seat-tube sticker said "Tange Cr-Mo Main Tubes." Seatpost= 26.0mm