Yes -- three rows of keys rather than four on the
keyboard, that's the
giveway. (It doesn't necessarily work that way on other company's
products, but Teletype's 5 bit machines have 3 row keyboards.)
Older Creeds have 3-row keyboards, in fact the Murray code has the
characters assigned so that the Figs shift of QWERTYUIOP are 1-0 in
order, if you see what I mean.
Later Creeds, like the famous 444, have 4-row keyboards with a mechanical
blocking arrangement so you can only press those keys for the shift (LETs
or FIGs) that the machine thinks it's currently in.
-tony