Limited edition to 300 pieces sinn watch 910 anniversary limited edition tan leather 910010 tan leather to celebrate their 55th anniversary sinn watches have designed this vintage style chronograph known as the sinn 910 anniversary limited edition watch but this is not just any standard sinn chronograph in addition to a stopwatch the piece also features a split seconds mechanism for recording intermediate times enclosed within the polished stainless steel case is the valjoux 775 rattrapan