I have a Rolleiflex, but I can't understand the model.
Taking lense is a Planar 3.5, and the other one is a Heidosmat 75
f/2.8, and it has a meter of the same kind of the "T".

It seems to be a 3.5C or E, but according to rolleiclub.com:

- The Planar C should have the serial number above the name plate.
Mine doesn't.  And it should have a Heidosmat 80 f/2.8 as viewing
lense, but mine is a 75mm.

- The E models should have serial number engraved above the name plate
or under the taking lense, but mine has only two serial numbers and
both are ON the lense.

Heidosmat 75 f/2.8   2447618
Planar 75 f/3.5   1952815

Thanks.

.....................................
Marco Baldovin
www.whitewave.it