OMEGA, Speedmaster, chronograph

Case size: 42 mm
Material: steel
Movement: manual, caliber 861
Year: circa 1970
Crystal: plastic crystal
Bracelet: original bracelet, folding clasp, ref. 1171/1/633
Reference number: ST 145.022
Serial number: 28428336
Case number: 145.022-69 ST

Later bracelet and dial
Please keep in mind that an overhaul might be needed, since no service history is available.