Need help identifiying this Rolleiflex

Hello, I have used this Rolleiflex 3.5f the last couple of months. I now switched to a 2.8f and want to sell this one.
BUT, I have trouble finding out what type it is.
Based of the serialnumber, this should be a Type 1 Model, it also has the EV coupling. The odd thing is, that I can switsch between a 12 and 24 exposure setting, which came (from my research) with the type 3 model.
Can anyone help?
Thanks in advanced!

According to https://tlr.rolleigraphy.eu/sn75.php#f it seems to be a model 1.

It's 3.5F correct. Don't beat yourself up on which variation. It's late and I can't find my Rollei book. Being a 12/24 I'd say it's the last of the line i.e. a model 3. Then again it might have been retrofitted by the factory.

Your camera is not a so-called White Face model. Those were the last production, but I am not sure of the dates. Another clue: does your focus knob show one scale (Meters)? Or does it show dual scales, Feet and Meters? The later production had dual scales.

Pieter12 said:

According to https://tlr.rolleigraphy.eu/sn75.php#f it seems to be a model 1.

Click to expand...

Yeah, thats what I also found. Its just that the 12/24 switsch came so much later.

Kodachromeguy said:

Your camera is not a so-called White Face model. Those were the last production, but I am not sure of the dates. Another clue: does your focus knob show one scale (Meters)? Or does it show dual scales, Feet and Meters? The later production had dual scales.

Click to expand...

The focus knob is only in meters

beemermark said:

It's 3.5F correct. Don't beat yourself up on which variation. It's late and I can't find my Rollei book. Being a 12/24 I'd say it's the last of the line i.e. a model 3. Then again it might have been retrofitted by the factory.

Click to expand...

So, was this usuall to have your camera retrofitted? Seems like a big change.