Does Rolex Oyster Watch have Transparent Base!?

Answer is " Yes"!
Ref. 1675, GMT-Master, Transparent Back Rolex, "Oyster Perpetual, GMT Master, Superlative Chronometer, Officially Certified," Ref. 1675. Made in 1961.
Cal. 1560, rhodium-plated, 25 jewels, straight-line lever escapement, monometallic balance adjusted to 5 positions and temperature, shock absorber, self-compensating free-sprung Breguet balance spring, Microstella regulating screws.
Dial, case and movement signed.
Diam. 40 mm. Thickness 13 mm.
Price $20,000-30,000 asked in an Auction.HK Snob