The Rolex Datejust 31mm (Reference 6827) featuring an 18k yellow gold and stainless steel (two-tone Rolesor) configuration paired with a white Roman numeral dial is a highly sought-after vintage midsize (or "medium") timepiece. 

Produced primarily from the late 1970s through the 1980s, this reference serves as a versatile unisex model bridging classic elegance with everyday durability.

• Case Size: 31mm (frequently designated by Rolex as a midsize or medium model).

• Materials: 18k yellow gold fluted bezel and crown, paired with a stainless steel mid-case.

• Dial: Crisp white dial accented by applied or printed traditional Roman numeral hour markers.

• Crystal: Vintage acrylic (Plexiglass) featuring the signature magnifying Cyclops lens situated over the date at 3 o'clock.

• Movement: Rolex Caliber 2030 automatic, self-winding mechanical movement. Note that this vintage caliber utilizes a non-quickset date, meaning the time must be manually advanced past midnight to change the date.

• Bracelet Options: Typically found on either a matching two-tone Oyster bracelet or a two-tone Jubilee bracelet.