The Tektronix scope on the bottom isn't "odd" -- it's a rack-mount version. I can't see the model number on the front panel (top left of the mainframe control panel), but it will be something like 7xx3, e.g., 7603 or 7613. The first digit (7) indicates the series (7000-series), second digit is the relative bandwidth of the scope (4 ~ 60MHz, 6 ~ 100 MHz, 7 ~ 250 MHz, 8 ~ 400 MHz, 9 ~ 500MHz, 1 ~ 1GHz), the third digit is the mainframe function (0 = standard scope, 1 = bistable storage, 2 & 3 = low and high speed storage, 4 = dual-beam) and the fourth digit is the number of compartments (3 or 4). Three of your plug-ins are vertical preamplifiers and the one on the far right is a single timebase plug-in.
Dean