Hi,
I checked my archives carefully.
Alembic inlay logo on your bass was found 73-47, it is latest 73' made.
73-43 has older inlay logo, and 74-53 has silver plate logo.
Because I think, your bass is 44 to 46.
By the way, I can't found 73-44 on their delivery list.
If your bass was born as 73-44....
I'm waiting for Mica's comments.
Eiji