Explanation of the reference numbers


History of the Speedmaster

Differences through the years

NASA tests

Buyers guide

Photo album

None Professionals

Speedmaster Quartz

Speedmaster 125



Abbrevations for watch case materials Strap/bezel material type Mechanism type Supplemental function type
BA : Yellow gold 1 : Leather strap (men's) / bracelet (men's) 0: Manual winding chronograph 5: No date
BC : White gold 2 : Leather strap/diamond decorated bezel (men's) 4: Manual winding chronograph 6 : Date
BG : Pink gold 3 : Bracelet (men's) 6: Self winding chronograph 8: Chronometer
BT : Platinum 4 : Bracelet/diamond decorated bezel (men's) 7: Non-chronograph
DA : Yellow gold combination 5 : Leather strap (ladies') 8: Quartz or tuning fork chronograph
DG : Pink gold combination 6 : Leather strap/diamond decorated bezel (ladies')
DD : Gold combination
DL : Gold combination
MD : Gold plated
ST : Stainless steel
TA : Titanium and yellow gold combination
TI : Titanium
TL : Titanium and pink gold combination
So, for example, my own Speedmaster Professional has reference number 145.012-67ST which stands for :
Leatherstrapped/bracelet, Manual winding chronograph, No date. The 012 stands for the pre-1968 model (Thus with cal.321 and metal applied logo). ST stands for stainless steel case material.