The Rolleiflex that accepts 127 film and is commonly known as  "The Baby Rollei"
These "Babies" are favorites of many collectors.
There are a few different models.
This collection is still quite small, but the cameras are real little gems!
B&W and Color Film CAN still be obtained for these cameras. 
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White Face Collection
Rolleiflex 4 X 4 Original
Type RF 410 (1931-1933)
Production Serial Numbers: Approx.135.000-523.000.
Camera # 133571. Lens: f3.5 CZJ Tessar
Shutter: Rim set Compur 1-1/300th  B-T
This is the first Rolleiflex to incorporate the famous crank advance. Positive film stop, distance scale on focusing knob, depth of field scale on back of hood, target type sports finder with center peep-hole. Shutter release is incorporated into cocking lever.

Rolleiflex 4 X 4 Baby Sport
Production Serial Numbers: Approx. 622..000-733.000.
Camera # 642665.
Lens:  f2.8 CZJ Tessar # 2096987.
Shutter: Compur-Rapid 1-1/500th  B&T
Filter Size: Bayonet 1.  (Taking lens only)
A single lever under the taking lens both cocks the shutter and releasesw it. Depth of field scale and exposure guide on back of door. Cast nameplate.  Sports hood with pop up magnifier.  Red window on back door has removable plug (often missing.)
This camera received a CLA in Feb 2008.

Rolleiflex 4 X 4  Post-War
Gray Baby (1957-1961)
Production  Serial Numbers: 2.000.001-2.099.999.
Camera # 2005749. Lens: f3.5 Schneider Xenar
# 273369.
Shutter: Synchro-Compur MXV. 1-1/500 & B.
Filter Size: Bayonet 1 (both lenses.)
Light gray leather with dark gray trim.
Knob film advance with film feeler, interior baffles, exposre value system, film reminder on focusing knob, and sports finder.
Manufacturer specified that this camera was available with the Tessar or Xenar lens. However, no cameras with Tessar have been reported. 
Includes hard case, strap, lens hood and lens cap

Thanks for visiting the 4 X 4 collection. 
Rolleiflex 3.5 Collection
Rolleiflex 2.8 Collection
Trading Post
Rolleiflex "Postwar Black Baby"
Camera # 2065583. f3.5 Xenar lens # 8925004.
This is the most rare of the 4 X 4 cameras. It had a small production run and is much sought after by collectors.
Although it appears the same outside as the Gray Baby, it is quite different mechanically. This one has black coarse grained leather.
Although the manufacturer listed this camera with either the Tessar or Xenar lens, no cameras with a Tessar lens have been reported.
If you know of one, please report it to this site.
Including: Tropical case, leather case, Lens hood and meter  known as the Rolleilux Combination.

This page was last updated: March 10, 2014
All three of these cameras are for sale.
All have their original leather cases too.
Left: 4X4 Model 4RF 410. CLA  2010.
Center: 4X4 Model 4RF 430. CLA 2009
Right: 4X4 Model K5 Grey. CLA 2008.

This photo gives you an idea just how small the Baby Rolleiflex cameras are.
They are just 11 X 7 X 6.5 cm with focusing hood down. And the Grey Baby is just 1 cm taller.
Click on the link below to take a look at a photo taken with this camera in May 2010.
The negative was photographed on a light-box to create the digital file.