€27.900 Regular price

Audemars Piguet 18k Royal Oak 1970s

When todays Reference 4100 - the third iteration of AP’s iconic sports watch - was launched in 1977, it was the first to feature a central seconds hand and, at 35mm, was designed for those who found the jumbo models too big.

This 18k 35mm reference 4100BA is in a condition that will make any collector sweat. The black petit-tapisserie dial, made by Stern, bears the old-style Audemars Piguet signature and is in fantastic condition. The case has the correct winding crown without the logo. The bracelet is in good condition and fits a wrist of up to 18.5 cm. The watch has the caliber 2123, a modified Jaeger-LeCoultre movement, as is often the case with AP.

Our particular Reference 4100BA features a 35mm solid yellow gold case with a sapphire crystal, an unsigned crown, a polished gold bezel, and a grey colored hobnail dial with a yellow gold 'stick' handset.


  • excellent overall condition, showing minor traces of use 
  • 3- body 18k yellow gold case with screw down case back
  • has been polished in the past
  • 35 mm (without crown) / 44 mm (lug-to-lug) / 23 mm (bracelet) / 7,5 mm thick
  • Year: late 1970s
  • Ref.: 4100BA
  • total weight: 153g


  • Audemars Piguet Cal. 2123 - automatic
  • 33 jewels, 28800 A/h, 40 hours power reserve
  • revision 03/2011 at Audemars Piguet Madrid (invoice with details included)
  • professionally serviced 02/2024
  • +7sec/d / 270°


  • original never touched grey colored hobnail dial in flawless condition
  • original hands, dial & crown
  • hands have been relumed in the revision at Audemars Piguet (03/2011)


  • the 18k yellow gold "Royal Oak" bracelet can be worn up to a 18,5 cm wrist / 2.2 mm thick
  • original Audemars Piguet clasp



Has this been authenticated?

All watches at Goldammer are guaranteed authentic by our trusted watchmakers and us. Certificate included!

Has this been serviced?

All watches at Goldammer are professionally serviced before being offered at our shop. Servicing is done by our trusted watchmakers and gone through very capable hands.

Mechanical guarantee?

Each watch comes with a 1-year mechanical warranty so if anything goes wrong, please let us know immediately.

Inspection period?

We definitely want you to love your watch, so you always have 14 days to fall in love or return to Goldammer, no questions asked.

How much is the shipping?

We exclusively deliver worldwide via DHL Express which is free for you.

General care?

Given that most of our watches are around half a century old, they will need to be treated with extra love and care, and they require servicing every 4-5 years.

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