Mechanism: The Rolex 710 is also known as the Gruen 827 and was in fact made by Aegler (as were all Rolex movements prior to 2004). It is one of the many movements derived from the Hunter 10 1/2. This is the 17 jewel version. Main spring: 1,50 X 8 - 0,09 - 270. Manual wind, screw balance or super balance.

The 710 is closely related to the Aegler 700. The primary difference is the position of the second hand. The 700 is "sub second", whereas the 710 is "center second".

Type: The Rolex Bubble Back or Bubbleback was first manufactured in 1933. These watches got their name due to the fact that the auto wind mechanism appeared to simply be bolted onto the basic Rolex movement. This attachment was rather large so it was necessary to round out the case back in order to accommodate the mechanism in order to allow proper functioning of the oscillating weight which made complete 360 degree rotations within the case. The Rolex Bubble Backs were produced possibly as late as the early 1960's. Many good examples exist to this day possibly due to the simple and durable basic 18 jewel design of the movement.

Most of these watches were time only and also had a sweep second hand. Later models included a date mechanism and were possibly the first DateJust models produced by Rolex such as the model 6075 which was manufactured in 1948. Some of these early Bubble Backs also had subsidiary seconds bits and many also had the popular California dials which had both Roman numerals and Arabic numerals. None of the Bubble Back cases had bezels that could be removed. Rather than the watch crystal being held in by compression using a bezel crystals were installed by the constriction method. The most common crystal used for these watches is the Tropic 30 crystal. It measures 2.6mm in height. The inside diameter is 24.6mm and the outside diameter is 25.5mm. The Bubble Back shown below has a Registered Design of 6015. Case sizes for the gents watch is 31mm, the ladies is 24mm. Lug sizes for the gents watch is 16mm and the ladies is 13mm.