Bubblebacks are fun, they have no-holes cases (like the new watches) and cases are bigger, chunkier proportions-wise. It makes them very desirable visually and somewhat modern. The 6105 Big Bubbleback is a large size, 36mm watch with a non-screw crown. Case and dial are original to the watch, including the Super Oyster crown. Watch has been previously polished.
 
Details:
 
Make: Rolex
Model: Big Bubbleback
Reference: 6105
Year: 1951
Material: Stainless Steel and 14k Gold Crown
Dimensions: 36mm
Crystal: Plexi Glass
Movement: Automatic 
Bracelet/Strap: Leather Band
Lug Width: 20mm
Box/Papers: No