User manual Sigma BC 1009 STS (English - 100 pages)
User manual Sigma iD.Life (English - 2 pages)
Sold at Auction: Patek Philippe. Montre bracelet en or jaune 18K (750) cadran sigma mouvement mécanique Patek Philippe. An 18K gold manual wind bracelet watch with sigma dial Ref: 4622/2, Circa 1980
Vintage Beta Sigma Pi Watch Women Gold Tone Round Leather Band Manual Wind | eBay
Vintage Beta Sigma Pi Watch Women Gold Tone Round Leather Band Manual Wind | eBay
User manual Sigma SC 6.12 (English - 51 pages)
User manual Sigma PC 26.14 (English - 14 pages)
Vintage 18 Karat Rose Gold Lady's Sigma Bracelet Watch with Manual Movement. sold at auction on 2nd August | Bidsquare
Sold at Auction: Patek Philippe. An 18K gold manual wind cushion form bracelet watch with sigma dial Ref: 3544/1, Purchased 2nd February 1978