The 465M is a militarized version of the 465, not the 465B. The
465B is a later revision of the 465, with a couple of
enhancements. The 465B includes a A-Trigger view (which can be
used as a 3rd channel), the ability to cascade the vertical amps
for 1mV/div sensitivity, can sense 1X and 10X probes that are so
equipped, and includes a 10X horizontal magnifier, allowing sweep
speeds of up to 2nS/div. Both scopes are excellent pieces of
equipment, the 465 and 465M just have a few less bells.
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+ I usta cudn't spel enjinere, now I ar wun +
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