Original Timex TX replacement strap T3C255 300 Series Perpetual Calendar - leather strap white - 20mm Alternatively fits all 300 Series Perpetual Calender models: T3B771 (stainless steel strap chrome silver, white dial) T3B781 (stainless steel strap chrome silver, black dial) T3B791 (black leather strap, black dial) T3B801 ( Braun leather strap, white dial) T3C321 ( Braun leather strap, white dial) The scope of delivery includes a strap, without a watch Don't know your Timex model number? Just send us Pictures Of their Clock. Gladly over e-mail, SMS, WhatsApp: Contact information see under Legal information of the seller