Whilst not specifically being sold as an alembic strap it is a strap being sold with the alembic trademark logo.
.https://reservationleather.com/collections/guitar-and-bass-strap


https://reservationleather.com/products/copy-of-the-ultimate-padded-any-width-any-length-and-engraved-leather-guitar-bass-strap

I am guessing the strap with a copy of the Alembic logo was a one-off order for a customer who is an Alembic fan. The image of it is one example of many of the type of work they do and an example of what they can make from provided artwork. There is no ordering option for a strap with an Alembic logo. I still love my Moody Leather straps but some of the ones shown look really nice, no idea of comfort level, though.