These Hamilton watches are quite well designed and they actually look smaller than 42mm, more like 40mm in hand due to the white inner dial bezel and overall design. The watch is in good condition and has original band, box and manual. 
 
Details:
 
Brand: Hamilton
Model: Chronograph Cal H21
Reference: H765560
Year: Unknown
Material: Stainless Steel 
Dimensions:  42mm
Crystal:  Sapphire
Movement: Automatic H21 Chronograph
Bracelet/Strap: Original Rubber Band
Box/Papers: Yes/No (manual only, no card)