1337GCSRI8 RTC-72421A: PURE SN DS1307Z+T&R/C01 1338-18DVGI RTC-72421B: PURE SN DS1307ZN+T&R/C02 1338-18DVGI8 RTC-7301SF:B ROHS RX-4801JE:UB 1338C-18SRI RTC-7301SF:B0 ROHS ISL12022MIBZ-T7A 1338C-18SRI8 RX-4045SA:AA PCF8564ACX9/B/1,02 1338C-31SRI RX-4574LC:B PURE SN ISL12027AIB27Z-T 1338C-31SRI8 RX-4575LC:B