Info micro-seiki A-1200 armbase

You need to mount it and measure the pivot to centre of hole to get the pivot to spindle distance and the size of the hole.

For what its worth it looks like either an A1201 or A1203
A1201 the hole would be 28mm - Micro arms 505 etc
A1203 the hole would be 30mm - FR64S

Thanks Dover,
the hole is 32mm and surely it is not the A 1201 which is already in my possession.
I try..

It's not the 1203 as this has the hole dead centre of the base (to be used with FR-64). This one is off centre, so probably 1205 for Micro MA 505 series or 1207 for Micro MAX 237, depending on the diameter of the hole.

So summarizing:
It is not 1201
It is not 1203
In the photos of 1205 that I see on the internet seem very different, I measure the pivot to centre of hole and it is 237...
so what?

1500 series?

DeKay