It's a 10PA15C. Came apart easily enough. That's the good news.
The prognosis is bad. The bearing has seized and wallered the shaft. There's now a lip on the shaft that has captured the pulley. (Yes, the circlip's been removed.
)
Matt, it looks like I need a new compressor. Are there people out there who rebuild the early ones or am I destined to install the modern (cruddier) version of the classic?
Again, thanks for your input.