The Xenar 210 f:4.5 takes a #3.
The Xenar 210 f:6.1 takes a #1.
The Symmar 210 f:5.6 can be in a #1 or #2, or even a #3 depending on age.
The G-Claron 210 f:9 is also in a #1.
Some of the later Repro Claron's in the 11,000,000 serials are in Copal 0 size. Mounting hole would be about 32mm and some of the earlier ones are in Compur 2 size which has a mounting hold of around 50mm. None are in a #1 size.