ChrisR said:I think it might be older than that, possibly now a SM4201 or SM4203 head. If you take the head off, the types will be stamped on both parts, if the plate isn't too rusty to read.
They made them with all combinations and permutations of switches and wires, too.
Note the nuts on the valve. They don't do them like that any more, so if you have to change the whole valve (ie if the spindle's leaking) it won't be a quick job, given where it is an' all.
Dead right about the screws Stan!
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