I haven't got one now but what model of Leica would you be intending to use it on? Although an R3 is technically a 3 cam jobbie Tamron gave out a specific warning when they still sold them that the R3 usage was not guaranteed. They were designed for the R4 and later models.
Indeed, I was only ever successful in using a Tamron 24/50 zoom and the 80/210 on my R3, but with the R4 all the Tamron lenses I had at the time were OK.
I want to use it on the R4S as I have an SP 28-80mm f/3.5-4.2 and an SP 70-210mm f/3.5.
I have a Tamron Adaptall for Leicaflex SL that fits the R4S but is a bit fiddly on the cams and I have NO apperture info on manual as I have to meter stopped down.
Thanks for the info.