Figured there might be a showcase thread. I was going to look before posting but spaced on it.... thanks for the link.
There was a time when I was seriously interested in a very close relative (#73-39)... I laid awake nights, reading every Showcase Thread I could find on these early models.

#73-44 is a missing serial number (though it may be the Tiran Porter bass) and #73-45 is a similar guitar that pops up on eBay every so often.
Hey, some people save stamps... I memorize Alembic minutiae.